Poor service

I have a home router for MTN and all I wanted was to cancel it so I can upgrade to a better one. I booked in my router at Greenstone Mall and was told to contact 135, and I was given a ref no IRM***6. On the 17th July around 11:45 I contacted MTN on 135 and for 36 minutes, I was sent from pillar to post, I think I spoke to about 10 different persons but at the end of the 36 minutes I was still not helped, I decided to end the call as it was going nowhere, just a waste of my time. I have lost faith in MTN, won't be upgrading with them. Their staff was so useless, they just wasted my time. At least they have their router back I won't bother calling them again