Incorrect billing and wrongly handed over

MTN customer service is horrible. Firstly, my account was handed over without any communication. They could not prove that I was sent comms that my account will be handed over. Secondly, I have provided them with my new banking details and they failed to debit my account then they had me over. Thirdly, I paid the arrears amount and to date I have not received a statement nor confirmation that my account is up to date, Lastly, they still have not debited my Absa account, the next think I will be wrongly handed over. The agents are rude and they also cannot account to anything