Refuse to cancel contract

I was on a contract with Vodacom for a year, before and during this time a always had reception problems, so at the end of my 1 year contact i decided to cancel my contact, went into the branch to cancel and the clerk canceled to contract but the next month money was taken from my account and the contact continued, I took this as a mistake and went back and canceled again, they apologized and redid the cancel, this time I got documentation to confirm my cancellation but this morning i got another debit order to state that my contract did not cancel and on top of that i did not have any reception for the last 2 days, not even at the spots where i normally had, so i want this contact canceled and my money back so i can move to another service provided, IM OVER WITH VODACOM!!