Expired contract

So it seemed like a good deal about 2 years ago to take a 2 year data contract with vodacom for R199. I soon realized it was a bad one because it depleted her fast. I could not wait for the contract to expire. Finally a sales consultant called to offer me a new R250 data contract and I obviously rejected it. But guess what come monthend they debited R250 from my account not R199 that has expired. It does not make sense that Im suppose to go and cancel but why impose on me a new contract that I reject without my signature. You guys are ******* and I can't begin to comprehend what makes you think you can take an ex client's money without his/her consent. How desparate are you to keep your stupid company afload? You are a bunch of ****s!