the bad service continues at mtn and nobody cares

I have sent my complaint via different mediums now,even with hello peter but still nobody has since followed up after that lousy response I got from the supplier asking for my details.i even went to the extend of personally visiting the head office at 14 avenue,and all I got was the ever so busy supervisor Sarah Naidu who was busy in a meeting and sent one of her staff Nozipho to make empty promises and get rid of me up to today im waiting for a call from them.i was told that my case would be escalated to the regional manager,but instead I got a shocking call from a very shalow Chantelle who was just unproffessional and unconstructive,asking me who had sent me to the head office she said she is the store manager at clearwater mall,but there was nothing of managerial charactor about her.What recause do I have though as I am just not getting anywhere.im hating mtn and the fact that im bound by a contract to such ********* and unfair service.