Bad Service and over debiting on account

On the 15th of July multichoice debited my bank account with more than double my usual payment. i called the call centre and they said someone would call me back. nobody has called me yet. then on Saturday they switched off my dstv 4 times and then on Sunday it was off from 7 am till after 4pm. after numerous calls nobody has called me back once to try and solve this problem. my extraview is now disconnected by multichoice without my consent, they are overcharging me due to an error by one of the people working for multichoice. When you ask to speak to a manager cause the call centre agents do not know what the problem is, you get put on hold for 20 to 30 mins and eventually you hang up.