Vodacom are crucks

I had a contract with Vodacom and my contract ended in December 2014 and I went to Vodacom Canal Walk to sign the papers to cancel the contract. I have done the paper work and submitted the copy of my I.D and thy sd it will be canceled by the end of the month of Jan 2015. And they debited the money month end of Jan 2015 I phoned them they sd I must give them notice for a month I did that. And they debited again but they don't load BIS. I phoned the cancelation department they appologised and thy said everything does reflect on the system the contract is canceled. But till today they are debiting my money. I received my bank statement thursday 14.05.15 Vodacom debited again into my account. I phoned the customer service they said they will get back to me they gona send the query. This is very fustrating and its been three months now Vodacom is debiting into my account after I cancelled the contract and I've been quering but nothing happening. Am very dissappointed in them they say they taking care of their customer and they provide high quality of service but their customer service is extremely poor. I want my money back and am gona switch to other service providers am very ****ed