Billing issues for two years!

This is the 7th complaint report that I am writing. My account was removed from legal but flagged with (Payment Plan) How can I be on a payment plan I settled my account in 2013 but I am still paying for the airtime that you don't want to stop. I am paying R200 every month on this contract, Firstly it was settled years ago secondly on my contract I used to pay R129. I am receiving R100 airtime every month that MTN doesn't want to stop. I no longer want to upgrade I want to terminate this contract and want all my refund back! I will never use MTN and would never advise anyone to do so. You don't update your payment records at all, service is bad, call centre you hold for hours till you give up! I want you to end my contract immediately I don't owe MTN anything and I want all my refunds back! This is ridiculous, this is the 7th complaint!