BAD SERVICE AGAIN

After waiting two months to upgrade, I finally received my handset and was able to upgrade. MTN apologised for the inconvenience, but AGAIN I am at the receiving end of BAD SERVICE. The handset that I received was faulty, I was told the handset must be send in for a warranty assessment. I was informed this would be done within the next few working days and I should receive the new handset within the next two weeks. It has been a week and a half, they have not even begin to asses the faulty handset and AGAIN I'M AM LEFT WITH NO PHONE, EVEN THOUGH MY ACCOUNT IS ALWAYS PAID IN TIME!!!!! when I call customer service, the line goes dead when I select the option to be transferred to a consultant. PLEASE CAN SOMEONE CALL ME AND GIVE ME SOME SERVICE!!!!