Deducting money of my account and contract is finished

Cell C refund my money please. I will now take this to the Consumer Onbudsman. Call centre refused to give me his name. I am so sick and tired of these cell phone companies ! My contract finished 6 months ago and I cancelled this on at least 3 occations before. They keep deducting R105 of my account monthly for 2 gig carried over. The data was used very few times in the past and the data is supposed to be carried over. I had a problem before where they opened the contract and data was charged. I told them it must be a top up account. This month deducting out of my bank account R466.