Theft and bad service

Last year dstv had this black friday promotion on a 12 month price lock contract which I took out. So the end of last month I called them to cancel my pricelock as I will be going away end of this month, so they told me I have to pay a settlement to cancel, wjen I asked how much they said to me I still have 12 months left. I asked them how can that be as it was a 12month pricelock, the consultant didnt answer me and they kept transferring my calls, so I started communicating via facebook so I could have proof of what they said. Fast forward and they bill an amount of R929 instead of the usual 785 which is 750 for my pricelock and 35 for insurance on explora. Its now been 18 days of continuously contact them on why they debited so much from my account of which they still havent given me a reason why and they just say my query is with billing department in the queue. Up till today still havent heard from them I just want my money back and to cancel my contract I wont pay for a service I wont use. If I dont get a response from them in next week I will be going to make a case of theft as taking something without someone permission is still regarded as *****ing. You cant just go around taking money from someone account that has not been authirised for you to do. I am so disgusted, DSTV only cares about taking our money they have no regard for customer service and satisfaction.