Hopefully the below information will help, based on the information below you should have been upgraded.

About SkyMiles
2010 Medallion Program Benefits
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Medallion Benefits
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Request Medallion Upgrades
Unlimited Complimentary Medallion Upgrades
We know, as a Medallion member, you want to sit up front. Those cushy leather seats are, well, cushy. So here's how the Medallion Upgrade program works.
Complimentary Upgrades
Complimentary Companion Upgrades
Complimentary Upgrades
Your Medallion membership entitles you to enjoy unlimited complimentary upgrades, subject to availability, on most published economy fares on Delta and certain Delta-designated codeshare flights in North America within or between the United States (excluding Hawaii) and:
Bermuda
Canada
Central and South America1
the Caribbean
Mexico
1Exceptions apply for this area of travel. See terms and conditions.
How It Works
When you make your reservation at delta.com, over the phone, at the airport, or through a travel agent, members will receive an automatic complimentary upgrade request. .

Once your reservation is ticketed, your upgrade will be cleared based on:
Your confirmation window
Availability
Fare class
Time of request
Priority Medallion Level Clearance Priority
1. All Medallions on Y Class Fares At time of ticketing by Medallion Tier
2. Diamond Medallion 5 calendar days in advance for revenue B, M, H, Q, K, L, U, T, E2 class fares3 followed by Award Tickets and Pay with Miles
3. Platinum Medallion 5 calendar days in advance for revenue B, M, H, Q, K, L, U, T, E2 class fares3 followed by Award Tickets and Pay with Miles
4. Gold Medallion 3 calendar days in advance for revenue B, M, H,Q, K, L, U, T, E2 class fares3 followed by Award Tickets and Pay with Miles
5. Silver Medallion 1 calendar day in advance for B, M, H, Q, K, L, U, T, E2 class fares3
6. Companions Within 24 hours of departure for B, M, H, Q, K, L, U, T, E2 class fares3
2Mileage accrual eligible only on published E fares

3Clearance starts with B class and continues in descending order. If Medallion level and fare class are equal, time of ticketing will be the tie breaker.

Once the window opens, the automated upgrade processing will continue to clear upgrades as availability changes, up to three hours prior to departure. When your upgrade clears, if you've provided us with contact information, we'll automatically notify you via email. Please make sure you have updated your profile to include your email address. When two passengers with different levels of Medallion status are in the same reservation, the upgrades will clear at the priority of the lower member’s status.

If your upgrade is still not confirmed when you check in, your pending upgrade request will be automatically added to the airport standby list.
Complimentary Upgrade Terms & Conditions
Availability:
Unlimited Complimentary Upgrades are subject to availability, may not be available on all flights or in all markets, and are not valid for travel to/from Hawaii, Transatlantic and Transpacific destinations. Complimentary Upgrades are not available on flights to/from South American cities that are serviced with our BusinessElite® product (i.e., Buenos Aires, Argentina; Rio de Janeiro and Sao Paulo, Brazil; Santiago, Chile; Lima, Peru; Caracas, Venezuela). For travel booked using a SkyMiles Companion Certificate, neither the paid primary passenger nor the companion passenger will be eligible for complimentary upgrades. We limit the seats available for use with complimentary upgrades and may not make seats available on all flights.. Upgrade on Award or Pay with Miles Tickets are not eligible for complimentary Companion Upgrades.
Ticket Changes:
Changes in reservations on ticketed itineraries are permitted only pursuant to the rules of the original economy fare purchased. Where permitted, changes may require payment of a change fee and/or any difference in the applicable fare.
Mileage Accrual:
Except for eligible Pay with Miles tickets and eligible Award Travel tickets, upgrades are not eligible on fares that do not allow mileage accrual. Upgrades do not affect SkyMiles mileage accrual. Mileage accrued is based on the original fare purchased. All SkyMiles program rules apply. To review the rules, see Membership Guide & Program Rules.
Fees:
Tickets purchased from Delta over the telephone or at an airport or city ticket office will incur a direct ticketing charge. Travel agents may impose an additional service charge for ticketing.
Miscellaneous:
Flight cancellation, substitution of equipment, or other irregular operations may result in the cancellation of confirmed upgrades. Delta's liability, if any, in the event of irregular operations is governed by the terms of its Contract of Carriage and shall be based upon the original fare purchased.
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Complimentary Companion Upgrades
You and a traveling companion may both enjoy the comfort of our First or Business Class cabins when traveling on Delta and Delta Connection carriers.
Your traveling companion must be a SkyMiles member and traveling on the same flight. Companions are cleared no sooner than 24 hours in advance of departure.
Medallion members and their companions must be booked in a revenue class of service: Y, B, M, H, Q, K, L, U, or T.
Companion Upgrades are not available for travel on Award Tickets or Pay with Miles.
Companion upgrades must be requested. If you and your companion are in the same reservation you can request your companion upgrade at delta.com. Otherwise, requests must be made over the phone with Reservations or at the airport.
How It Works
You and companion have different reservation numbers:

Your upgrade will clear based on your individual member status and confirmation window. Your companion’s will clear no sooner than 24 hours prior to the flight's departure.

You and companion share same reservation number:

Both your upgrades will clear no sooner than 24 hours prior to the flight's departure.
Companion Upgrade Terms & Conditions
Availability:
For travel booked using a SkyMiles Companion Certificate, neither the paid primary passenger nor the companion passenger will be eligible for complimentary upgrades.
Ticket Changes:
Companions who change their itinerary and are no longer traveling with the Medallion member after the change are not eligible for a complimentary upgrade. If an upgrade was confirmed prior to the itinerary change, the companion’s reservation will be changed to reflect the original economy class of service for the new itinerary.
Miscellaneous:
Both passengers must be ticketed, and upgrades must be requested at least three hours before the scheduled departure of the flight. Except as stated in this section, the rules governing complimentary Medallion member upgrades also apply to companion upgrades.
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