*********** service

I upgraded my contract on the 5th of Feb, after I upgraded from a top up100 to a my choice 50 contract, I couldn't make any outgoing calls, outgoing SMS'e or check my airtime balance. I called the call center, after been cut of numerous times, I finally got through and was told by the self help service that my number wasn't a valid contracts number! I eventually got through to an consultant who told me that there is nothing wrong with my account, told me they would refresh the sim and everything should work, nothing worked. I went back to the store on the 14th of Feb and the sales consultant lodged a query and she promised she would follow up, she did not, and I spent another week with a useless phone and a useless call center which keeps forwarding me to *********** people and when I want to speak to a supervisor, I get put on hold and the call gets cut. On the 21st I returned to the store and requested a sim swop hoping that would be the solution, the sim swop didn't go through and I had to return the following day, after a successful sim swop the problem persisted. My question is how does one escalate the issue, because the call center and consultants can't help me.