Appuling service. Even their seniors Bamphurile Sekommere will promise to call but he never does. Bad service ever

I had a Home Choice Account that was handed over to MBD and i settled the account. I asked for the paid up letter and I was at the bank busy with an application, but I never received the letter. The bank couldn't assist me with my request as MBD did not want to provide the paid up letter. The worst part is that they did not update my ITC, the account was handed over to them in August 2022 and I have been paying every month on time. I never missed. And it says I missed payments for 6 months. This thing Is really a disadvantage on my side, I cant do what I wish to do because of MBD. I spoke to Bamphurile Sekommere and who advise he will follow up but nothing was ever done, no feedback. When you call to ask to speak to him they would always say he is in the meeting and he will callback, he never does. Not even an update from MBD. This is harassment and I'm really frustrated at this stage. Where can I report them please, this is a torture because I have been paying my account