I have had the same problem when trying to contact them however, I found their facebook page and it lists their phone number there. I tried calling it, but no one answered and I got a generic home answering machine. Feel free to fill it with your complaints and comments as needed:
MarginMart Phone # (510)868-6077 *listed as US location*
                                      011-45718996 *listed as India location*

http://www.facebook.com/pages/MarginMart-Inc-parent-company-of-MarginMart-Electronics-Pvt-Ltd/173646619356050?sk=info