Worst Upgrade Decision Of My Life!!!

I was contacted by Mondo on the 16th of April to upgrade my mtn contracts. I did, and after wanted to change my contract term and I wasnt sure if I had given a colour preference. After numerous attempts I couldnt get hold of them and sent an email to the only address I could find to cancel the upgrade as I would rather go in store. After sending messages via messenger Nivash eventually got hold of me and I cancelled again. By the Friday it still wasn't cancelled and by some miracle I got through on their landline. Tea then cancelled again and sent me a reference number. On the 26th of April my phone bombed out and I went into MTN to upgrade. Low and behold the upgrade hasnt been cancelled. I have left numerous messages via messenger they read it at don't respond. Worst customer service, wait saying that would actually imply they have customer service which they do not. This has been an endless battle and I still can't upgrade. Worst upgrade decision of my life.