Seller ripping me off on postage

[mickledore0]

I made an offer on an item inclusive of postage. Seller accepted my offer but is now demanding postage on top of the agreed price. What can I do? I cannot see anywhere to report this to ebay!

[*guinevere*]

When you make an offer the offer includes postage on top at the rate set by  the seller. You cannot make an offer including postage if the seller has listed the postage separately.

[mickledore0]

But this was an item that I was offered the chance to make an offer. My offer cleared said that the price I was offering included postage. He is now saying tough luck. He accepted the offer inclusive of postage but has changed his mind and now wants more than he was offered and accepted.