MTN Cancellations

My MTN contract has expired in last years. I have paid this account as it when to a month to month. I cancelled the month to month the beginning of March 2020. Two weeks ago i get a call from the CCS (Credit Solution Services) as the account has been handed over for +- R700. No contact from MTN at all stating that the account is in arrears or informing that the account is still active. At that point the cell number was not even active anymore, which clearly state the contract was cancelled. I have tried to call mtn numerous times......... good luck o bud. No one answers there phones. I took a drive to canelwalk mtn they where close. I`m awaiting on the CCS to get back to me with more info to see whats happening to this account. Depending on its outcome, i will be seeking legal advise from the OMBUDSMAN, as i can see no replies from MTN on the forum.