CANT RECEIVE CALLS: NO RESPONSE FROM TECHNICAL DEP

I realised a few months ago that certain numbers cant get through to me, or text me. I have since phoned the call center 4 times who at first attempted to fix the problem, but realised it needed to be escalated to the technical department. My calls were made on the 19/10/2015 x2 (escalated to technical department), 21/10/2015 and 31/10/2015. Every time i phone now they say they cant do anything except write a report to the technical department who has not contacted me...STILL NO NEWS OR CONTACT. I then asked to cancel my contract (because i am paying for a service that i don't receive) but the lady has not sent forms through as promised. I have chatted to the management on duty at the call center 3 times who say the same thing the call operator says: \we will send a message through to the technical department". THIS IS A JOKE! I want someone to contact me otherwise I will protest outside the Telkom Mobile shop in Pavilion where i took the contract out."""