You have to send the microsd card with bill to the Delhi verbatim address. Call them in advance regarding RMA
Also write a letter mentioning what is the problem & your return address.
Takes about a month, but you get a brand new RMAed card.
Verbatim Marketing India Private Limited
1101, Chiranjiv Tower, 43, Nehru Place, Nehru Place, New Delhi, DL 110019
011 4652 5661