A contract cancelled 6 months ago still owing

After having made a payment of over R5000 for a contract, I decided to cancel my contract with Vodacom. On the 28/7/2014 I sent my cancellation forms to [Email Removed] as i was given a settlement amount of R1272.00 which i paid and emailed the forms including my ID copy to Vodacom. I was then told i owe a further R2400.00 which was OUTSTANDING because of a premature cancellation which i paid on the 23/9/2014. I asked if this was all that needed to be paid and that would i have rid myself of this contract. the answer was yes. after so many months since i last had a chat with vodacom i received an email saying I'm still owing a further R838.32. I've been calling vodacom for a while now to get clarity and all I'm getting is being tossed around from one department to another. retentions.cancellations department cant help me as im not on their system anymore, finance department cant give me the answer im looking for. Please help<br> <br> Account number: I***-3<br> Account Holder: Moses Mokaila