I booked flight to FCO in July
Initial routing XXX-JFK-AMS-FCO and return FCO-CDG-BOS-XXX. Booked Delta one, Z class. I knew that partner operated fights (JFK-AMS-FCO and FCO-CDG-BOS) would not get accelerators for MQM/MQD but fare was good and was first/business.

Thanks to Delta's frequent schedule changes I was able to change the outgoing fights to XXX-ATL-FCO in D1, Z class fare
Another email arrived saying that the return flight need to be change as BOS-XXX would be a misconnect due to schedule change. So I changed to FCO-JFK-XXX all on Delta metal.

I did not see that the reissue of that ticket for the return changed the ATL-FCO from a Z class fare to OJ. So I received no MQM/MQD as it says it is not eligible for accrual. I have emailed my issue and tried Delta messaging. I have the emails with with fare classes.

Am missing something? Or do I have a legit case to collect the mqms, etc

Thx