Failure to Cancel Account and Billing Unduly

Upon receiving bad service from MTN in January I asked for my insurance to be immediately cancelled and expressed that I do not wish to renew my contract upon its expiration on the 15th of May. I have called countless of times thereafter to give notice of my cancellation and on the 15th and thereafter. Instead MTN has failed to honor the request and billed me, threatening to close my line should I fail to pay.<br> <br> It is impossible to get assistance from their Service centre and I have tried to visit the store and inquire on Twitter and all attempts have been unsuccessful. <br>