MTN Incompetence!!

I app**** for a Add Sim contract yesterday, which was approved, I received the cellphone and went home. Yesterday evening when I wanted to switch on the phone, I noticed that the screen was damaged. This morning I took the phone back to Tygervalley MTN, who informed me that I can either cancel contract or send phone in for repairs (the latter meaning my warranty will fall away and I could possibly be held liable for damages to phone), I thus chose to end contract which has not even been active for 24 hours!!! The staff at MTN has informed me that I can cancel by call centre, call centre says I must go to store to cancel.. I am furious with the service delivered and lack of competence by MTN. I will not be upgrading my devices when the time comes and I will be moving to a new service provider once my contracts have ended. As I still do not have a solution for the cancellation of my 24hour old contract. I refuse to pay for a device which I do not even have in my possession.