A ***** inside the company, no one to help

I went to African Bank for a personal loan, I got an option where they give me cash and a certain portion of money they settle one of the account for affordability. Till today they haven't settle the account now am paying for money that I don't were it went. It's almost 4 months now and both companies don't know how to help me. Cause this ones claim that they have paid, and this other one says that they haven't received any payment from African Bank. This has affected my credit score negatively and dragged my name into the mud. For which I don't know who can assist me. When I check the settlement letter that is from African Bank, it shows that Yes it has been paid but the account number is not mine except for my name. How can African Bank create this mess and refuse to clean up the mess. It's almost 4 months paying for something that I don't know where it is.