Consumer Redressal

I SUBMITTED MY PHONE OF MAKE HTCHD7 TO REDINGTON INDIA LTD,M 47 GROUND FLOOR,OLD DLF COLONY,SEC 14 GURGAON FOR REPAIR ON 20-12-2013 AND CLEARLY TOLD THEM TO INTIMATE ME ABOUT REPAIR ESTIMATE BEFORE ACTUAL REPAIR.NOW WITHOUT INFORMING ME ABOUT COST AND REPEATEDLY TELLING THEM NOT TO REPAIR,COMPANY HAD REPAIRED IT AT A COST OF RS 18071 AS PER THEIR VERSION .AT PRESENT THEY ARE NOT GIVING MY PHONE BACK EVEN AFTER MY MANY REQUESTS AS I CANT BEAR SO MUCH COST.PLEASE DO THE NECESSARY AND TAKE SUITABLE ACTION AS COMPANY HAS INFRINGED MY RIGHT AS A CONSUMER AND TRYING TO EXTRACT MONEY FOR NO MISTAKE OF MINE. THANKS