***HelpI I bought a fake Gucci bag from ebay****

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How did you pay for the item? With Paypal?--if you paid with paypal you could file a complaint with them, but you will have to show proof that the bag is fake and you only have a certain amount of time to do this. If you paid with check, money order, or bank transfer, the only thing you could do is file a complaint with ebay.
 
It's no use with Paypal in regards to resolution. If you paid with your credit card, call them up. They will settle everything for you from getting a replica. It happened to me once, and my credit card company took over. All I had to do was supplying all the necessary doc. and evidence requested.