Contract cancelation

I had a contract with vodacom which ended in September, I called in to make cancel it it when the term comes to an end. I called in a month and couple of days before the end term which was a perfect time to cancel it. I spoke to different consultants and have the phone records to prove that. Now I'm being told that the contract can only be canceled in November and I don't agree with that because I called in time. They even sending me data that I don't need it anymore. Once I use those datas they make me pay for them. Now I stopped using them. The last call I made I was told that they'll get back to me within 24 hours after investigation. More than 5 24hours has passed and still waiting.