Unresolved paid up account

Platinum family cash loans in Kempton Park refuse to update my payments for a loan of R3920 which I paid up.i called their office and they told me that the company is owed by new owners and they will check with them about my paid up loan.up to date nothing has been done and the loan its still flagging and ruining my credit profile.i went to their branch n paid them cash n the lady that helped me told me that his boss will send me paid up letter.until today they have been ignoring me.i can't pay for the account that I paid before.please help me to deal with this company.im tired of their excuses