Mtn is very ***********

I went to mtn on the 19th Jan to do an upgrade and I was advised that i will get 20gig and 14 gig as the addition of their promotion, the guy who assisted me advised that I will get it the next day on Sunday, until Tuesday I did not receive anything, when I call the call center they can’t help me and they say that mtn store doesn’t have a landline as it’s a walkin store, Wednesday I went to the store and they checked on the system and said the call center has to fix that n they log a query. I call the call center on Thursday with the reference I got from the store and they can’t pick it up, reference doesn’t exist