Little to no customer support

Got a cellphone contract over the phone with them 2 years ago . R310 was deducted from my account every month. My original papers got lost and I wanted to know when the contract will end. As I got a Cell C number with the phone, I went to the nearest Cell C. When entering the cellphone number on their system, I saw the contract was under the name of some company with another name. Jabba connect showed no where on their system. Cell C informed me that the monthly amount I pay for the phone I got was very high, that the handheld was paid off some time ago and that I was only supposed to pay R85 per month as that is the amount shown on their systems. I still pay R310. They also informed me that I could have upgraded some time ago already. I got hold of Jabba connect via email requesting them to cancel the contract. Then I got a phone call from them telling me they need to ascertain if I qualify for an upgrade! When I want to cancel the contract, the guy on the phone got very rude. After numerous emails, I found out when my contract end, but still no answer as to when the last payment will be deducted from my account or about when the contract sim will be switched to a prepaid sim.