******* charges on my Account

Going through my bank statement I realised that Vodacom has been debiting an extra amount of which I never authorised. Upon calling the contact center I was told its for data bundles which I phoned and cancelled in 2014 already and got notification that it was cancelled. Lerato the consultant kept putting me on hold because she was checking why and her explainations did not make sense. Bottom line is Vodacom is **********ly debiting my account for something I canceled last year. I buy data using the *111# and I select the once off option and the amount is immediately deducted from my airtime account and my bank account is debited as well. How, Lerato could not explain. I want a refund for all the months I was debited *******ly by Vodacom and I want the data bundles cancelled again. This is the worst service ever by vodacom. I want feedback as soon as possible.