NEw Blackberry Z3 screen lock

On 18 Dec 2014 I bought a New Blackberry Z3 (Imei***) )at Game store in Mosselbay for R2795,00. On 13 February 2015 I took it in for repairs to Vodacom ay Langeberg Mall, as the screen refused to unlock. A day after this I was informed it was send to Johannesburg to the advanced repair centre. There they found \ UNAUTORISED REPAIR-***** & PROTECTIVE SHIELD MISSING". I rejected their findings and their option to repair the phone with a 3month warranty. I request the full refund of R2795"