Paid for Express, Seller shipped Priority :( What to do?

Keep us posted & nighty night

Ok, I received a semi-automated response from eBay telling how much they value me as a member and that I have to ship the doll back to the seller at my cost. That seller knows I will not ship it back, it weighs over 5lbs. and I will probably pay over $100 to ship it. He and eBay are worth each other! :rant: BTW, his user name is bpzgap.
I will try to e-mail eBay back to explain, but I don't think they will do anything: he definitely brings them more money than me.