Blackberry 9720 & MTN - Not a good combo

I had a contract upgrade last April. Always been happy with both BB and MTN, so naturally I wanted another BB. Had a look @ the BB9720 and I was happy with what it offered. BIG MISTAKE. now, 10 months later I'm sitting with a piece of junk that MTN wont even repair, because their T's & C's give them a way out. The phone reboots whenever it feels like: in the middle of a call, when trying to take a photo, browsing FB, BBM. whatever. Googled to check if I can find if other pple have similar issues, and guess what. Common problem. This started 4 months ago. thought it might be the battery, bought a new one. still no luck. took it in to MTN today and after waiting for @ least 45 minutes in the queue, I'm told by an arrogant, rude consultant that I must bring a POP and the charger with or else it'll be treated as an out of warranty repair. And then he askes if the phone fell at any time, I am honest and say yes and he says this automatically means it's out of warranty. ***. I don't want a new phone, all I want is a phone that can be used. as a mobile phone!! don't worry about the phone that fell, just do something about the rebooting and switching off. Cant wait for my contract to end.