Htc
Bad Service On Warranty Product

I have a HTC Wildfire S mobile handset. It gave some problems & I took that to the authorized service centre of HTC which is called Apex Solutions, Jalpai More, on the ground floor of UCO Bank building. The took the phone & returned it to me after 3 weeks. They told me that they sent that to Kolkata. But they didn't gave me any legal document. Not even a job sheet. And the problem of the phone is as same as before. They are doing nothing without talking.