MTN Worst Service Provider

REQ:*** After calling the Manager at the Canal Walk Store , numerous times no one has returned my call after their consultants **********ly processed my upgrade earlier this month. I cannot believe that this is the level of customer service that one receives from being loyal to MTN for over 10 years. I have put up a complaint about this and no one has bothered to call me back. So the inaction of MTN as a service provider , means that the promote their sales people to be ************ when they make sales. I have had no call ,nothing from MTN to apologize for their dishonest behavior . I have called the call center , the store but it seems that there is never a manager who can articulate what the code of conduct is at their stores. I am utterly disgusted my their services and work ethic as a company. ***** MTN , are these the type of values that you instill in your sales people and customer service representatives ? I reported this incident on the 27th of July and no one has bothered to call or even apologize !!