Double charged, non existent call center,

My debit order bounced because I changed from a savings to a cheque account, however I settled my account the following day (R370-00). One week later I received a email that my account was in arrears and that I must immediately make a payment of R379. I the tried contacting the call center, but after numerous attempt attempts and cut calls, I gave up. So I tried resolving the issue by going to MTN in rosebank mall, where one of the support agents looked at the account and confirmed that MTN did receive the payment I made on the 2nd of March. He then promised to contact the accounts department and provide me with feedback within 48 hours and that I shouldn't make any additional payments, because he believes the second invoice was generated in error. One week later, after receiving a SMS from MTN that my service will be suspended and no response from support agent. I decided to travel to rose bank mall again. I then made a direct payment of R379 at the branch and was reassured that my service will not be suspended. A few hours later after paying double the usual amount my service was suspended. I lost all faith in MTN and will move my business elsewhere in the future.