Awful customer - lack of - service

If it could be a 0 it would awful customer service, I have been unsuccessful in changing the primary number on my account for over 1 year, the latest I've been advise is to go instore buy a new sim do a sim swop and they will then change the primary number, the number that was erroneously by Vodacom linked as my primary number does not belong to me therefore I will never receive the 1 time pin, I don't see why I have to pay to remain a customer that receives 0 customer service by buying a new sim and doing a sim swop..... DISGUSTING....... MTM will have a new customer as soon as my contracts expire......