Hi this was the response i got after 3 days .I appreciated your help
Thank you for contacting Chase regarding your United
MileagePlus Explorer credit card account.
We have reviewed the application that you completed and
the enrollment offer attached to that application states
you will receive 25,000 enrollment miles, 5,000 bonus
miles for adding an authorized user after your first
purchase and the first year annual fee waiver. In
addition, you can earn an additional 10,000 bonus miles if
you spend $25,000 in purchases in any calendar year. This
together equals the 40,000 miles offer.
The enrollment offer you are requesting states you will
receive 50,000 enrollment miles after your first purchase,
5,000 bonus miles for adding an authorized user within 62
days of opening, and a $50.00 statement credit. In
addition, you received the first year annual fee waiver
and can earn an additional 10,000 bonus miles if you spend
$25,000 in purchases each calendar year (January through
December). This together equals the 65,000 miles
enrollment offer, with the $50.00 statement credit.
As you requested, we have applied a $50.00 statement
and added 25,000 enrollment miles to your account. You
see the adjustments on your next billing statement.
If you have any further questions, please reply using the
Secure Message Center.