Settlement Letter complaint

I have paid my Getbucks account on 9 June 2021. I have requested for a paid up letter on numerous occasions and I was told that my account was handed over to MBD and i was also told that another company called Alliance Call Centre Services was also dealing with the account. During the phone calls i am told that MDB is suppose to sent the letter however there seems to be a delay from their side and no one is able to provide me with a turnaround time for this matter. I am pushed from one company to the other and to date i still did not receive the proof that my balance is now settled and that i do not owe the company any money.