Trerrible Service No Feedback!!!

My online upgrade with MTN was approved a month ago. Since then I have not received my device. I contacted them regarding delivery of my device several times a week. No one can give me an answer and I am told that I need to phone this number then they tell me to phone this number and so on. It has apparently been escalated to senior management and still not an answer. This is some of the worst service I have ever received. If this is not sorted out before the week has ended I will cancel the contract and go to another company. Don't make the same mistake as me and upgrade online. You will regret it.