Bad service

I am on 2 years explora contract and paying R584,00 monthly. Two months ago I hired R35 movie which was supposed to be added on my account and I was expecting the debit order of R619 to go off my account but I was overcharged by R126. I called Multichoice and explained the situation, the guy I spoke to confirmed that I was indeed overcharged and he will escalate my query, two weeks after I called again and the lady I spoke to told me my query is sitting in their journal department therefore they should release it from their side so that I get my money back however they will call me. I then waited a week or two for their call and no one called me. I called and made the follow up then the lady I spoke to told me the same journal department will call me back which I am still waiting even today. I am now fed up of making follow ups with Multichoice and my query isn’t getting resolved. I am even thinking of going to the bank this month after their debit order goes off my account and reverse it and honestly i don’t expect them to cut the channels after reversing the debit order because I can’t stand the back and forth, their service is so pathetic.