MTN, letting customers down since forever....

I complained on 10 December about an upgrade that went wrong done via SummerMobile. The incorrect handset colour was delivered and I was advised to take it to my nearest MTN store in order for them to IBT it back to the warehouse following which the upgrade would be cancelled, redone & the correct colour handset dispatched. I dropped the handset off at the Tygervalley branch with Moashida on 11/12/2015 & was advised by her to call the call centre in a weeks time (which is how long it take to get to the warehouse) in order to cancel the upgrade. I followed her instruction yet warehouse had no record of my phone. Thereafter, everyone clearly went on leave as I called the warehouse throughout the festive season to no avail. Upon returning to work I called summer mobile only to discover that they had no idea where the handet was. I called the branch & they too have no idea where the phone has gone to. They they asked if I had a collection order, yet nothing was provided to me by Moashida when I dropped off the phone. This service is utterly ridiculous and I am having to call daily to fix a problem that I didnt create. I have tried to call Tygervalley branch 6 times in a row - no answer