More than a month and handset still not repaired!!

On 02/03/15 I upgraded my handset to a BlackBerry Classic at the Canal Walk MTN Store. A week later, 09/03/15 in the evening, I removed the handset from its holster and found that half the screen was defective (display). The touch function still worked. I took the handset to the CW branch where I got the phone and was told that the screen was cracked and must go to the repair center in Montague Gardens. I took the handset to the Repair Center on 11/03/15 and was told to come back with the box as they would book it in as a Warranty. On 12/03/15 I booked the handset in as a Warranty claim and was told I would have feedback within 24hrs. On Monday 16 March after not hearing from them I went into the branch and was told that the warranty had been rejected and was now being assessed as a repair. After not hearing from them in 48hrs I returned to find out that they could not do the repair and the handset had been sent to an external provider for assessment. Since then all I get from them is that it has been sent to the manufacturer and has been escalated. If I do not contact them I am not kept informed. It has now been escalated with priority and no feedback. What can I do?