USELESS SERVICE/PROBLEM RESOLVING

WHAT MUST ONE DO TO GET SERVICE FROM MTN??? PORTED MY NUMBER IN FROM VODACOM TO MTN AND HAVE NOT BEEN ABLE TO RECEIVE CALLS FOR 5 DAYS NOW!!!!! THIS IS A BUSINESS NUMBER AND THIS AFFECTS MY INCOME!!! PHONING 135 IS A WASTE THEY JUST LOG ANOTHER TICKET AND TELL YOU TO SWITCH OFF AND PHONE AGAIN IN 2 TO 3 HOURS IF NOT RESOLVED. GOING INTO A MTN SHOP IS ALSO WASTE COS THEY JUST PHONE 135 TOO..... COME ON MTN HOW DOES ONE GET ISSUES RESOLVED????