MTN SOUTH AFRICA CUSTOMER SERVICE SUCKS

I cancelled my contract with MTN in August and I was told that my account balance is R0.00. This month I checked my credit score with Clear score and I found that my account status is Defaulted, and I called MTN on the 18/02/2021 and I was told that indeed my account has been handed over to their legal team they will enquire about the balance on my account and I must call back on the 24/02/2021 to follow up using this Ref number ***. When I called I was told that the legal team hasn't checked my query, and I must wait for next week and a new reference number was created. Their service sucks aren't they supposed to notify the client if there is an amount owed on the account before handing over or they don't comply with NCR Act they have their own.