Shipping to wrong address

Just looking for some advice and comment...

I shipped an item to the address that Paypal provided. After i had marked the item as sent, the buyer advised by email that he had made a mistake and left his old address on ebay and paypal!

Now, a month later he leaves me neutral feedback with a comment suggesting it was my fault! I might well have refunded him if he had of had the decency to ask. I will reply stating the facts and will certainly block him but would we all consider this grounds for complaining to ebay?

Gee, if I was so stupid as to provide a wrong address as a buyer I would not blame the seller! I suppose I should be grateful he did not leave me negative feedback.

Thanks