Cancelled contract still active and being billed

I cancelled a contract in July 2015 with vodacom after being **** to by the sales agent.<br> a month later, the device was finally collected. i was informed that the money that was debited would be credited to my account or allocated to the other vodacom contracts (which will not be renewed!) today I received my latest statement and the cancelled contract is still being deducted! whats worse it that when i phoned the cutomer (don\t) care line i get cut off and transferred from one dept to another. when I do get through to cancellations the unfriendly