I'm sorry this happened to you Skeen. If I were you I would not be happy with this transaction either
. 10 days of holding your money, no communication or shipping and then at last he wants you to pay extra? If the seller quotes the wrong shipping price it is not the buyers fault. It is not the buyers responsibility to pay if the seller messes up the shipping costs, and ebay does not allow a seller to ask the buyer for more money later either. Its a pity he cancelled it and refunded. I would be leaving bad (honest) feedback too
If he had contacted you right away about the mistake it would have been better, although he still should not have asked you for more money.