blackberry 9320 faulty

I bought a blackberry 9320 cell phone last year on 13 /06/2014. At pep cell cape town. I paid R1699 in cash. The contract on the receipts stipulates that the phone has a 2 year guarantee. The phone keypad became faulty early 2015, then the speaker also didn't work. I took it back to the store on 2 occasions for repair, and on both occassions they brought the phone back without it being fixed. They refused to give me another me another handset or pay me a refund. They were not helpful and have an I don't care attitude towards this matter. They never even called me to inform me that the phone is back from repairs, I had to figure it out myself and go to the shop and check. Very poor service.