What to do if an item you have bought could be fake?

[golfvip101]

I have bought an item that I believe to be fake and I am looking for a contact number for ebay to find out what I should do.  Does anyone know a number I can contact them on so I can check what my rights are or does anyone else know what actions I have rather than just send the item back?

Thanks

[plpmr]

adding to the advice already given -

Always be careful regarding feedback as the neg you left can be removed for mentioning eBay and trading standards.

[golfvip101]

Thanks. Have returned the item now as advised