unlimited minutes not being loaded 2 months after taking out contract

I done an upgrade in Sept 2017. It's almost December and I still haven't received my unlimited minutes. I have queried it so many times, and every time I get told that they will look into the query and have it activated. I keep receiving messages saying my query has been resolved but nothing is being done. Why can't MTN just sort out a query properly the first time round? Why do I have to keep going out of my way to the branch only to be told the same lousy excuse? Why am I wasting my time with worthless network? MTN has incentives in place to attract customers, and in return they offer the most pathetic service and no communication. In addition to this, they falsely advertise in their brochures, saying certain packages qualify for certain promotions but then I get told that my package doesn't qualify for certain promotions. What *******.