I want to upgrade, but MTN is not assisting with a system "glitch"

This is now the 4th time for me to post here. I upgraded on 15 Aug 2019. Was waiting for the phone to arrive, but nothing came. I enquired and they told me to wait another 5 days. Then on 28 Aug, they suggested to cancel the online upgrade. It will take 72 hours. Then days later, I had to phobe and find out what's going on. Okay, so they canceled it, but they never reversed the whole process and a MTN store was trying their best to assist, but also shifted from pillar to post. It's nearly a month later and I can still not upgade due to a system "glitch". MTN, if you don't want my money, just tell me and I'll go somewhere else. The service is really not what it used to be.