of not getting negative feedback....

suck it up and send him the chip again and you pay postage, also then I would return all the money he paid you so you basically give it to him plus plus postage....and then the hard part....

Just send him an email apologizing a few times and I like to ask is there anything I can do to make you completely satisfied...soemtime si will offer free shipping or halp price shipping on the next order (up to $5 or so)

then let the cards fall where they may
My wife made me realize it never pays to argue or anything with fleabayers...some of the buyers are wacko/s simpl;y put

Kiss some booty...swallow some pride and go forth

just my two cents