Lack of accountability!!!!

I have an account at Totalsports that was handed over to Vericred for collection. Vericred called me to offer me a discount from my outstanding amount. They said if I settle my outstanding balance they'll give me 30% discount. They then sent me a message with the account details and I deposited the money in December 2017. I called them afterwards to request a settlement letter, they kept telling me that they have sent it and when I check my emails it's not there. Now when I call them I am being sent back and fourth on grounds that my account is with a different branch. I have called four different numbers already and their are telling me same story, "your account is not with our branch, please call this number". When I call Totalsports to say I have payed up my account and I need them to clear my name, they say I need to deal with Vericred and that they can't assist me if I don't have the paid up letter.