-(minus) 100% on customer service for MTN

I have trying to cancell my contract for 7 weeks now, to no avail. You can only dial 135 with no luck. I have emailed , no response. I have phoned about 6 times with no luck. I have been in to 2 branches to help me - Guess what!! No luck. Ha ha ha I am now going to close my account to get rid of them. Customer service -(minus)100%