Non receipt of it refund

sir

I AM IN ARMY. MY IT REFUND OF RS 10670 FOR THE AY 2014-15 HAS NOT BEEN PAID BY IT DEPOT. I SUBMITTED ONLINE GRIEVANCE TO THEM MORE THAT 50 TIMES, ALSO WROTE LETTERS TO THEM BUT EACH TIME THEY REPLY THAT IT IS BEING CREDITED OR CHEQUE HAS BEEN SENT TO MY HOME ADDRESS BUT TILL DATE NEITHER IT HAS BEEN CREDITED NOR I RECEIVED ANY CHEQUE, CAN SOME ONE ADVISE ME WHAT TO DO NEXT.. CAN I FILE A CASE IN HIGH COURT AND IF SO IN WHICH HIGH COURT SHOULD I FILE THE CASE