CHEATED DURING WARRANTY PERIOD MICROMAX

I AM KALYAN SAMANTO MY HANDSET MICROMAX CANVAS 2 I GIVEN MY HANDSET TO SREERAMPORE SERVICE CENTRE DUE TO SOME PROBLEM IN MY HANDSET AFTER THEY HANDED TO THE HANDSET TO ME AND THE PHONE IS NOT GETTING ON.
AFTER SOMEDAY I AGAIN VISITED THE SAME SERVICE CENTRE THEY TOLD ME TO CHANGE THE BATTERY I CHANGED MY BATTERY AFTER THAT ALSO THE PROBLEM WAS NOT SOLVED
THEY TOLD ME THAT THE PROBLEM OF THE HANDSET WILL NOT SOLVE BY THEM.
PLEASE HELP ME WHAT TO DO???
WHERE TO GO??
IF THE REPUTED COMPANY DOES THIS??

I M KALYAN SAMANTO MOBILE NO.98044 87526
PLEASE HELP HELP HELP…………..