Sony Ericsson Mobile Model No W580i — change display in warranty period

Dear Sir / Madam
I purchased sony ericsson mobile(Model no W580i) from your authorised dealer in Vadodara.(Mobilewala GF-5, 6, 7 D tower, Kunjplaza, Lalbaug rd, Vadodara.) on04-11-08 in 9, 650=00. Invpoce no. 14320. Suddenly on 13-07-09 Phone display showed abnormal bliking. After some time there was no display on screen at all. On 14th July 09 I went to Mobil Wala shop for checking instument. He gave me service station address i.e. Shreeji Times 61/66, Marbal Arch, Opp. Vanijya bhavan, Race Course, Alkapuri, Vadodara. There they have checked & kept phone for display replacement & told me it will take 10 days to procure the display. But till today this fellow is not responding any thing about delivery of phone. Will you inform me What to do?