Unable to cancel an expired contract. Now I'm still paying for something I don't use.

I have canceled 2 expired contract a month ago on the 7th June. I recalled vodacom Friday 6 July and found out that no cancelation was processed. I asked them again to cancel the 2 contracts. They said they will email me the confirmation of cancelation. Up till now I have not received the confirmation of the cancelations. Could you please get somebody that knows how to do there job get to call me. Thankyou