After upgrade,sitting for 4 days without a phone

I went to MTN Greenstone for an upgrade on Friday 06th Oct 2017. I was given a new phone but I didn't switch it on. I charged it when I got home. The next day my old phone wasn't working and so I headed back to the store and was told to do a sim swap, which I did. Then I waited about 5 hrs to switch this phone on,in the meantime I dnt have any form of communication, the phone still wasn't working. It was switching on the whole time but no service. Sunday morning again I had to go back to the store and was told it would be fine after about 2 hrs. I switched it on after 3, just in case. And guess what? Still the phone had no service. I then decided to call 808 with another phone and was told the sim swop I did, I had to activate it but the people doing that do not work on weekends, so I have to wait till Monday to do so. I am appauled at the bad service that was given to me by mtn and after having a relationship with them for 11 years I never imagined I could say I regret going in for that upgrade!!!!!