Totally embarrassed, disgusted and defamed by MTN for staff negligence

Total embarrassed , devastated and disgusted I had a contract with you MTN in 2020 for data ,in 2022 I canceled this contract via the call center and one of your branches as it reached the 24 months period and I no longer required it .In 2023 I lodged a query stating that I am still receiving a billing statement .It was logged no one ever attends to it, 2 months later I visited another one of your branches only to realize I'm still being billed .I have call logs from the site I visited with my queries and 4 years later I am still being billed.The last query is being opened and unassigned at Mtn since 2023.I have called you customer care line, your cancelation line ,your business line ,your ***** line, your legal line etc throughout these years with no help ,I now apply for finance and get told that I have a default on my name from MTN for the value of app R 30 000.How unacceptable is this for the incompetence of your staff .If I was handed over to legal, please proof to me the communication and any interaction regarding this matter. I am totally disgusted that you think it's ok to play around with people lives and livelihoods. Do you even consider the impact it has on a person.