The worst customer service received from an MTN outlet todate

I have a terrible experience at MTN Westwood Mall. The representative Queen, took a month and half to deliver my business upgrade. After receiving my device she promised to email me the invoice and signed agreement so that I could claim the R3000 online Samsung voucher which she didn't do. I had to complain to MTN business to get these documents emailed to me. When I finally received the documents I went onto Samsung member's to redeem the voucher and I was told that it wasn't loaded by the store from whom I bought my device (MTN Westwood Mall) and I need to go back to them. I went back to them and now Queen and her manager Gift is telling me that when I received my phone the voucher was no longer available. This wasn't told to me or discussed with during the delays experienced during the upgrade of my device. This is absolutely ********** abuse of consumer trust, patience and knowledge. Our company will definitely be looking at a different network provider going forward.