MTN - USELESS!!!

I cancelled my contract (mobile data - it was not the renewal with new phone) in the beginning of July. MTN then told me that there is a credit owing to me. I advised my banking details changed. Charelle Brockman had then requested I send proof of my new banking details by proving a confirmation letter with the new details, from the bank. I do so, the same day. This was end July. MTN then got back to me with a statement saying I hadn't paid my account and I was to send proof of payment and that they had gotten the credit amount owing to me incorrect. Long story short, almost three months later of back and forth and arguing and proving myself, the deposit gets done INTO MY OLD ACCOUNT. Now MTN say they are sorry, they can't do a reversal as ABSA has taken that money for bank charges. NOT MY PROBLEM. I provided all necessary information in advance, as requested by MTN. I want my R373.26 back, that was deposited in the wrong account. How did this become my fault???? The service is DISGUSTING. 101 different people respond to customer service e-mails so no one person actually knows what has been said and done from day one. Nobody can get their story right and nobody has bothered to pick up the phone to me. The first time in the past three months, somebody has phone me today because I have thrown my toys out the cot. I am absolutely appalled by MTN and nobody can give me an email address of a supervisor or somebody higher. Why must I be at a loss for THEIR ERROR????