Vodacom pathetic poor service i have ever see

i did have contract with vodacom and it was due for cancellation. i sent them notice to cancel one month in advance to cancel my contract on the due date. Vodacom didn't cancel the contract and keep on debiting from my account. i went to Vodaworld in Midrand to show them proof that they were supposed to cancel two months back. they said to me they do late cancelation and credit my money. on the 3rd month they send me sms to proof my cancelltion and credit. after two months vodacom legal department phone me said my account is arears and it was handed over to ITC. i phone vodacom they said i must call vodacom legal department. Both department failed soved my problem as they said it not their responsiblity. i went to Vodaworld and they the manager told me it is not their reposibility. Vodacom legal department said it also not their reponsibility. now who is responsible to cancell and clear my name.