bro, you're careless, whenever you buy electronics or anything expensive and second hand, why dont you do some research first? you're way too trusting.
look at the ipod touch 3g online, its features and what to test for. ive met buyers like you that show up and without even checking the product just pay and take off, then when they dont get what they want they return stuff and waste their time. i sell stuff like it is, take time to look and know and learn, look how much time and effort you're wasting on this guy because of a careless buy.
Sure he ADVERTISED 3G but then hes dumb, you're gonna be just as careless and dumb as him? Ive bought electronics here also, i always do a through check on the products i buy. its what i want and its working and its everything the seller says.
Ignorance isnt a defense, its a poor excuse to be uninformed.