Cellphone contract

Had a phone contract with vodacom for 2 years. Phoned to cancel it and was told it would be processed .After the month I phoned to cancel the contract had passed was still being debited every month .I then phoned vodacom again and was told it will be processed. Being 3 months after my contract had being expired and I still get debited every month .Phoned for the 4th time vodacom consultant informed me the cancellation as not being put through.worst service ever.