3 months ago I was promised account adjustment by a Tmobil supervisor that has not been applied

My husband & I took a trip to Cuba back I'm May 2023, we were totally disconnected from our family not just because we didn't want it to talk to them but because  we did not have any internet connection or text messages services!, before we departed to our trip I purchased a month pass of extra coverage of data to be connected during our trip, little did I know T-Mobil does not have service in Cuba as a matter of fact internet sucks there, however, We did receive/ and made some calls through WhatsApp when we had few minutes of internet connexion only in  our hotel room through their WIFI. When we arrived to The States I had a bill for that particular month of over an eleven hundred dollars. I called T- Mobil before my bill was due which is the 26 of each month  to dispute those charges, my account is on auto pay so the whole amount of payment went thru regardless talking to them before payment was withdrawn.  After many calls to T-Mobil to dispute international data usage that were NOT done by  phone calls or internet but due to a fact that my daughter gave me for Christmas an Apple phone tracker that stayed in the States, In my stupid thecknology  ignorance I did not know that the little devised was causing those charges till I received that ridiculous phone bill. to make long story short, after many hours spend and to put on hold  many times on the phone with several T-Mobil representatives and supervisors account went to escalation team, one of the supervisors called me to let me know that after reviewing and escalation they were going to give an adjustment and credited to my account the whole amount of international data charges that suppose to be applied in the next two billing cycles that was promised on June, However that never happened now almost 3 months these charges still are unresolved. I stopped auto pay and my coming bill is due this week. (lost autopay discount too)

Can some one help me Please