Micromax — data card no MMX219W NOT working

Address:

Vellore, Tamil Nadu

i purchased MMX219W data card on 20.10.2014 and used for four months.then it did not work.so i gave it to micromax service centre at vellore.on 21.03.2015 smart communications2/14 2/14 vellore city centre vellore-632001. after one month it was not handed over to me.i request that steps be taken to hand over the data cardto me as early as possible A.VISWANATHAN 276 VALLALAR STREET VELLORE 632006