Over charged

I am on pricelock paying R550 every month but on the 20th an amount of R880 was debited from my account without my concern. I called multichoice on the 22nd to quiry that and was told that my complain was escalated to the high authority and they will come back to me but they never did. The following week i called again and everytime i make a call my complain is treated as if it is new. I made the third attempt last week and got the same treatment. I called again this morning and asked to speak to a supervisor but was told that it is impossible and was told that my refund was only processed today while i had been put on hold. I am really disappointed with their service. I had to spend over R400 to get hold of them for a refund of R300. I want Multichoice to account, i am spending my children's money trying to get them to account for their nonsense.