MTN- terrible aftersales, billing and retention ability

Also another lousy company that fot their cancellation fee and have not sent me written confirmation althiugh a credit trace indicates the account is closed. Theses buffoons handed me over to debt collectors coming to find they had calculated arrears on an account that should have been closed. I still paid the cancellation fee, bcoz I had a device that was not in use but was still within the contract cycle. When the contract ended I refused to continue paying, so that was what I owed in cancellation calculations. All debt collectots have failed due to MTN not sending the correct papaer work to me. You guys have mediocre service responses, not a single person has given me the cancellation confirmation they all tell me I was handed over evem though I have sent them wrottem documentation of our agreement and payment.