Hello!

My question is less about missing miles but more about incorrect mileage accrual which I think still fits the topic.

I flown TK very recently. Was initially ticketed to fly in and out of SFO but had some plans change and called in their customer service to change the flight to on the return depart from JFK. I was initially booked into Q but when the change happened I asked the agent which fare I'd get and he clearly stated E. The email confirmation (old look and feel) says E.

I got an upgrade with miles for that segment in the meantime.

I just got credited my miles equivalent to class C. Checked my physical ticket and indeed it says C. C is 1/5 of E in terms of miles.
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so... Any ideas why it might have been turned into a C? I imagine nothing to do with the upgrade right?

Do I have grounds to appeal? Before doing so I'd love any thoughts on why I got this fare class anyway.

Thanks