O.P, this is a good attitude you have raised. Definately eBay should look in to these type of cheats and charlatans who are out to fraud guilible buyers by mentioning Bill and Warranty when they can provide none.
The simple way to weed these type of sellers (for eBay) is to first ask for their business license and than ask them for invoices of the products which they are claiming to be sold with warranty. I believe eBay.com (the parent US site) has a policy where any seller doing a business upwards of certain amount is asked to provide purchase invoices by PayPal (an eBay company). Any product which is above a certain value should carry a manufacturers/importer's warranty and the seller should be able to show a chain from the importer to him.
Not only the seller you mention but there are dozens of such sellers who are fooling guilible buyers by mentioning bill and warranty on their products when actually these are all grey market products which neither will have valid bills nor will have any warranty worth the paper it is printed on.
O.P., you still have more shocks in store for you. You would be very lucky if your product was repaired or replaced under warranty even if you agree to send it to Delhi.
The modus operandi of these cheats is to say: all we offer is service warranty. The product will be serviced for free but you will have to pay "X" amount as spare part charges. This X amount will cover both spare part cost, service charges and a good amount of profit.