Company not returning mobile which was given for repair

SIR I HAD GIVEN A MOBILE PHONE FOR REPAIRING TO ELECTRONICSEWA.COM AND THEY CALLED ME AND I TOLD THEM THE ISSUE AND THEN THEY TOLD ME THAT THERE I A PROBLEM IN A CHARGING JACK AFTER HEARING MY ISSUE.I ASKED FOR THE TOTAL COST OF REPAIR THEY TOLD ME THAT THEY WILL CHARGE 800 RS( INCLUDING 200 AS A SERVICE CHARGE) FOR THAT AND ALSO GIVE ME 6 MONTHS WARRANTY.AFTER 3 DAYS I GOT MY MOBILE PHONE REPAIRED AND THEN I WENT TO OUTSIDE DELHI BECAUSE I HAVE AFTER 12TH BOARDS HOLIDAYS BUT WITHIN 1 DAY IT AGAIN HAD THE SAME PROBLEM.SO AFTER COMING BACK TO DELHI IN A MONTH OR TWO. I AGAIN CALLED THEM AND TELL TOLD ABOUT THE PROBLEM WHICH IS OCCURING AGAIN THEY TOLD ME THAT THEY WILL CHARGE A SUM OF RS 300 FOR AGAIN REPAIR THAT..I HAD GIVEN THE AMOUNT AND TELL THEM TO REPAIR THAT ONE. NOW THEY ARE SAYING THEY ARE NOT ABLE TO REPAIR THAT ONE.I ASKED THEM FOR MONEY REFUND BECUSE ITS IN A 6 MONTH WARRANTY THEY ARE TELLING THAT THEY WILL NOT REFUND THAT AMOUNT.