Cancelled contract, still deducting payments.

Vodacom sold me a contract October 2014 and when recieved wasn't what I expected. Cancelled it the following day and few days later Ram Courrier Picked it up. For more than a year they still deducting for a product I don't even have in my possession. On the 02-12-15 there were another payment then the following day (03-12-15) I went to Vodacom's Regional Office here in York street(1) George,spoke to the lady infront, she called Vodacom Direct for me(***), they assure me that it will be cancelled and they will re-inburst me for all that months within 21 working days. a week later I called a local Vodacom Branch just to make sure that it has been cancelled and the lady i spoked to, said yes it has been cancelled on the07-12-2015. Last night Vodacom deducted another Monthly Premuim. I JUST DON'T KNOW WHAT TO DO ANYMORE, IF THAT IS HOW THEY ***** FROM PEOPLE, I WISHED I NEVER EVER TOOK SOMETHING FROM THEM AGAIN AND I'LL TELL EVERYONE I KNOW I EVEN PORTED MY NUMBER FROM THEM AS WELL. IT'S BAD BAD BAD BAD...