MTN SA no service or communication

Requested for an upgrade on Sunday @ Newmarket Alberton. I was told all is well and i can collect my phone on Tuesday as they had no stock in the shop. Then at +/- 11am on Sunday i received a message that my application placed on hold until i submit further documents. I tried phoning the shop numerous ties on Sunday with no luck. On Monday i phone again and agian and again. Eventually i spoke to a lady and she told me that Headoffice require further details as it is credit limit increase. Monday night i received message confirming they still busy. Today i have been phoning non-+stop and again no one answer the phone how is this possible! Until now no one has told me what is the problem as i have great credit score. MTN Headoffice and Newmarket has no communications s****s