unjustified negative

I have just received a negative from a buyer which I feel is unjustified. My listing clearly stated the postage cost for the item (which is the postage & handling fee really). They paid instantly after winning, no questions asked, but are now complaining it was excessive??? It is really annoying that someone can destroy your 100% feedback and I can only leave them a positive in return.

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Is $3-$4 excessive for packaging and handling?

 

Buyer knew cost before bidding and this is why I feel negative is unwarranted. 

 

Don't bid if you are not happy with the P&H costs, I don't!