same thing happened to us but i told the tit i smoke a jag and my costs posting the item incur jaguar fuel costs driving to the postie,its tuff poo that they complain after agreeing to purchase somthing the stupid f~cking b@stards know the price of before commiting to it all.
a good one to message back is "read the auction",say thay a few times and at least you know you have irritated the tit.