Sorry to hear about this situation Malvai. Having been a member of Audiogon since 2000, I fortunately have never been conned, though there were various tries. However, I have been quite cautious in my dealings. Some of the scams I faced were -
1)The classic Nigerian scam ( this was sometime in '04, before Nigerian scams were in vogue), wherein the user said he was owed money by his friend in the us, so his friend would send me a higher amount than the equipment I was selling was worth, and I had to send the balance back to him via wire transfer.
2) Some guy in Indonesia would offer to pay more than what I had listed the equipment for saying that he felt I was underselling the equipment.
3) Many times some highly desired items, for instance the B&W 801's would be listed for a quarter of the new price.
etc.
So like other FM's have adviced be very careful with your dealings in agon or any other site, especially since most purchases from India are likely to be International transactions. And if it sounds too good to be true, walk away. Unfortunately there are hardly any avenues to recover your money after being cheated, paypal etc. will not do much. I know that hindsight is always 20/20 and this will not help Malvai much, but as the tone of the thread is veering towards avoiding future mishaps I thought I would post my experience.
Cheers,
Sid