I purchased a ticket in August for $350, canceled and received an ecredit. I then used that ecredit last week to purchase a similar ticket (same destination, round trip) but this time for $700, paying the difference. The ticket has now been flown and my account was credited based on the original $350 ticket. Chatting with Delta's iMessage help line, I am told that MQDs are always credited based on the original ecredited ticket rather than the flight flown, which did not seem right to me.

To drive that point home, I asked if I had booked a $100 ticket, canceled and then booked a $10k D1 ticket using my $100 ecredit, would I receive MQDs based only on the original $100 and was told that would be the case.

Anyone heard of such a think or encounter similar? Thanks!