MTN allocate my payment please!

I have been trying without luck to cancel my contract with MTN since March. I was put on a month to month contract after my official contract ended. I wasn't too pleased about this but thought I would pay up and close contract so that my number can be moved to prepaid and I keep my number. Since then there has always been some hindrance towards canceling my contract, amounts increase and decrease at whim and noone can explain why. I thought let me pay up and be done with them. Unfortunately that was not the case, for the past two payments my money has not been allocated to my account and when it eventually is, I have missed the 20 day notice period to cancel my contract. At the moment I made a payment on 30 Aug and till today the money has not been allocated to my account. I started calling them on 3 Sept to follow up and cancel my contract as I was fully paid up. Till this day, I have had case after case open to investigate and allocate my funds to my account. I have supp**** all the necessary documents at early as 5th Sept to no avail. I am exhausted from speaking to consultant and consultant who claims to escscalate the matter on my for me to receive an email that the ticket is closed as the requested info is outstanding which is untrue as I have sent the POP as well as the date of transaction 3 times to date. I was on the phone on 29th Sept for 45 mins going from consultant to consultant to resolve this issue and was assured it had been escalated and would be resolved in 48hrs.Well today 30th Sept I have received another email stating the ticket opened the day before is again closed for lack of requested info after the consultant assured me all info was on the system and the Billing/Banking team had to allocate my payment. I am at my wits end. On top of that my number is suspended so without wifi I have no internet access. And I "agreed" to a payment plan to pay off money I have already paid and an extra R200. I can tell you I did not I am beyond frustrated and noone seems to be able to assit me. An organisation so vast with braches all over cannot allocate a payment, mind you I have been paying from this account and using the same reference for the duration of all my contracts +-6yrs. I am happy to supply receipts, the service and level of incompetence is alarming.