Taking advantage of debitorder

And yet again this month, Multichoice deducted R1,628 from my account. Last month it was R1,928. On 1 Sept 2015 they rectified the mistake and R1,149 was credited to my account - great news! NOOOO this month it is YET again abuse of my debit order. Is this going to happen every month now?? I want this to be sorted. I am a single parent, working 2 jobs to afford Multichoice and this is how they treat their customers? We are paying such a high price for their service, should it not be better than this? NNNOOOO, my problem is not sorted yet!!!