Bad bad bad service!

I received my new wifi router with simcard yesterday morning. I phoned the MTN activation number *** 5 times. Everytime they asked me my details and then said that my simcard number is different from the one on the system and they place me on hold, where I am cutted off everytime. I ran out of airtime with my last call. Until now, no one is trying to call me back. If I tried to dial *141# on the new simcard, it gives an error message SUPPLEMENTARY SERVICE ERROR: CALL BARRED. What ever code I tried, same message. Why did MTN send me the wrong sim? Why can nobody assist me? I'm a deaf person and also can't always hear the call centre agents very clearly. Please get your house in order. I'm going to report this to the Ombudsman and my laywers.