Failure to Update

Good day. I had a loan with you which was handed over to Landau Attorneys. In November last year I called Landau and was assisted by Nomthandazo Dladla who gave a settlement letter of R9866.46. I then paid this amount if full and email my POP to Landau and two weeks after paying I got my paid up letter from Old Mutual which stated that my account was paid in full. On friday I went to Old Mutual only to find out that my Account is still in arears worth R1125.18 for Collection Commission. I spoke to a manager named Zivikele Gasa from Old Mutual DBN Gardiner branch and he advised me that there's nothing he could do as I need to call Landau to find out what is this Collection Commission. I called Landau today and they advised me that this account is paid up and closed and they are not aware of this Collection Commission I should go back to Old Mutual. Now my question is why was this collection commission added after I've paid up my account...who did it and why. If they had extra charges why they were not added to my account before I was given a settlement letter . Please assist I need someone sort my query as soon as possible.

Regards Ayanda