I am unable to cancel my MTN contract

I visited the Northgate Service centre 60 days prior to my contract termination date 17th June and completed the forms required. The consultant said he would do everything from his side but he knows it won't be cancelled. That got me concerned. I went back 30 days prior to the cancellation date and got a reference number. i was unable to complete the forms again as apparently they are on the system. I now cannot visit that service centre as it is closed due to the strike. You cannot get through to anyone on the 808 number or *** number which I was given by one of the branches. I am so frustrated. I have been with MTN for 18 years and I am now fed up of their lack of concern for customers. All I want to do is cancel my contract and revert to a pay as you go with the same number-can anyone advise?