[Resolved]  Sony Ericsson W705 — keypad not working

my mobile W 705 bought in may 2009 is not working.has key pad problem.i had submitted the mobile for repair but they kept my mobile for 2 weeks and still did not repair it,hence i had to take my mobile back from them and that too not repaired.my mobile is within the warranty period.
kindly help as my work is being compromised because i dont have my mobile and it is a great inconvinience to me.