Unhappy for Vodacom service after 10 years being a loyal Vodacom Customer.

I am so horrified with the bad service on vodacom. I been trying to cancel a contract for the past year with them for 5gig data which plain down can see i have never used for 1 year The sim destroyed. I was told The amount for this contract was taken out of my account. They refused to admit the error blaming me saying i was wrongfully advised at their branch to cancel the contract at gateway branch but was not now vodacom takes out money from my account not advising me prior to this about this amount. I really hate vodacom now because to call so many times to cancel the contract finally when i think im talking to the right person he tries selling me somthing else when clearly im telling the guy i cant afford any more expenses im trying to cut down. He tried selling me some promotion thank god i never take that offer coz i read here in one of the reviews a complaint about it and coz i declined the offer i was turned down my refund process and the blame shifted on me.