Tell him to detail WHERE in his listing he mentions the $5 handling fee.

Also tell him that his hike in shipping is fee avoidance and that he could get severely reprimanded for inflating shipping costs to make a profit.

Tell him he is making more than enough pocketed money, since it will only cost like like $4 to send PARCEL POST. Also, demand delivery confirmation.

He is complaining because he cannot con money off you, or at least the expected amount.

Do know that perhaps the games may not work when it arrives... Yeah, he may be that much of an asshole...