Bad service

My Ackermans account was handed over to this company early in March 2021, things were going smooth I was even paying my account at the store until I was offered a percentage cut of which I took. I made my final payment on the 5th of August. And was advised that my settlement letter (payed up letter) will be emailed or send through whatsapp even now I'm still waiting. I called multiple times asking about this but I'm only told that the matter is not at the hands of the finance or whatever department. The problem is that now I'm being called by other attorneys saying that I am still owing. Even now my name is not cleared as they had promised to do on the beginning. So disappointed!!!! All I want is a payed up letter so I can clear my name and stop getting calls from different attorneys ☹☹ I was not even offered any reference number just told that calls have been logged in the system