need an action on 1 month delay in getting my phone back, is still pending

Location/place: dehradun

Name of company/service: HTC/ warranty mobile repair

i have submitted my HTC Wildfire which is in warranty period at dehradun htc phone collection center, they give me date of 14july to recollect it, but today is 28july and still they donot know about my phone, i have called the customer care a lots of times also visted collection center more than 15 times they are just keep on giving me date of next day to collect, but its too late now, wasted a lot of time and travel cost and still did not get my HTC phone back.i need a strict action against HTC company and the collection centre dehradun. plz process my request i have suffered a lot because of this. my htc serial no.is SH14SPY03416 and its HTC Wildfire. my contact no. is 09986504037