Transcend — Transcend pen drive not working properly

Address:	Kolkata, West Bengal
Website:	transcend-info.com

I bought a transcend pendrive on dated 10/05/2014 invoice no 699 from nadisur infotech (ph no-[protected] & email id [protected]@rediffmail.com).

But last 3 weeks this pendrive is not working properly.. so i went to customer service center..
1) superton kolkata
2) 73 melcalf street
3) central plaza, bb ganguly street
And many others.
They send me one address to another address..
I call snapdeal and get the service center address but the information is not matching..

The call main head office again and again but no one received my ph..

Kindly help me