MTN KEEPS DISAPPOINTING ME

I’m so disappointed in the manner my upgrade took place, after having to complain about how their courier company inconvenienced me for almost a week!! My phone finally arrives but guess what it’s not what I’ve ordered, now I am here stuck with a phone I can’t use because it is not what I want!! When I called the upgrade department I was asked a silly question “ what difference does it make, you can put a case on the phone” unfortunately it does matter I wanted a Gold iPhone not the graphite that was sent to me!!! And this is not the first time this happens the last time I took out a contract with them a blue phone was sent instead of black!! And also why can’t I change the phone at the nearest mtn store? Sort this out mtn not this time around