Mysteriously canceled upgrade and poor service

I did an upgrade on 27 November. It was an online upgrade and I used a black friday special. The next day I got phoned by DSV to check if anyone contacted me. I rep**** no and she said someone will be in touch during the course of the day. Nothing. This morning 2 Dec I called mtn to see what is going on. The gentleman told me that the upgrade was canceled and gave me a number to call to follow up. I called this number and was told I need to call sales department and I was given another number. When dialing this number the message was "the number you have dialed is incorrect" I then phoned the first number again and after explaining the situation to the lady who answered she responded with "what is your query" I gave up. Absolute pathetic service. So disappointed and disgusted