repairs complaint

ON THE 22th December 2014 I bought a Blackberry device at Exact. on the 29th December 2014 I returned the device back to Exact for repairs. I made a follow up in January 2015 and I was told that the device was not returned to them. I personally phoned Mtn Repair Centre, and I was told I was excepted to make a payment of R330.00 which I did on the 11th of February 2015. I made a follow up and I was told that the phone was waiting to be dispatched. I have made numerous calls enquiring about my device, the agent I spoke to told me that my device is beyond repairs and I will receive no help, I will have to use the device as it is.