Not Wanting to repair or exchange faulty cellphone

I've upgraded my son contract in December 2014 with a Blackberry 9720.During February 2015 he started having problems with the phone that didn't' want to charge. I booked it in for repairs on 16 February 2015.On the 5th of March 2015 i received a sms saying the phone was ready for collection. When i got to the store , i was informed that the phone was beyond economical repair(BER) but i would not be getting a replacement. What was suggested , was that i take the phone to a repair shop to have them sort it out for me so that i don't pay the 22 months that are left on my contract for nothing. I mean really! This is **************** expecting me to pay for a product which is faulty and which they don't want to repair or exchange! Stay away from these ******* and rather take your business elsewhere!