PHONE REPAIRS

Goodday. I hope somebody here will be able to help me. My husband bought a Blackberry 9720 from MTN Paarl Mall in December 2014. On prepaid. After about 5 months the phone started giving problems. Just shutting down although it has 50 % battery power. We took it in to MTN Weskus Mall Vredenburg. They told us that the warranty expired just the previous day, but according to us the last day was the day we took it in. They send the phone away and it came back after a week with a new battery. 2 days after we started using it again, it started with the same problems. After struggling to get hold of MTN and being disconnected a lot of times, we managed to get hold of Weskus Mall Mtn manager. Not very helpfull to say the least. The problem is, we live in Hopefield. 50km away from the branch. Now we have to drive all the way again to take the phone. We just bought a BIS bundle which will now be lost because we won't have the phone. We used a lot of airtime trying to get hold of the right people and all they do is shake their heads. My husband needs the phone daily, as this is the only means of communication between him and his boss. But they can't give him a courtesy phone to use. Bull!!!