Incompetence and apathy

My Cellphone contract was migrated in error by MTN at the end of Febuary and penalties and new charges loaded. The accpimt also did not receive the free data and airtime that it was supposed to receive in terms of the correct contract. I am now sitting at the end of July still waiting for relevant credits to be passed - the penalty fee has been credited and the correct contract is being billed, but neither the data charge or the missing airtime has been rectified (I was billed full rates during this period). I have called the help centre countless times and logged queries, I have even called on their customer service centre in Sandton four times to try and have this resolved, with absolutely NO result. I have been a customer of MTN's for about 20 years and this is just ridiculous. Absolutely no customer care exists and absolutely no interest in keeping the customers you have. It is incredibly frustrating trying to deal with MTN - the onus is always on the customer to run around and follow up, the staff never take the responsibility for this. What has to happen for MTN to fix their own error properly??