Customer service should be revised at the store.

MTN has extremely poor service and waste innocent peoples time and money. Several calls made and I was promised someone from the store will call me back and nobody does. I'm trying to upgrade my package and they always have an excuse, 7 hours later and 4 calls and a visit to the store and no feedback. Specials which started 23 DAYS and they still do not have the codes on the system. why waste my time and money i will rather go to another service provider who can give me service