hi I recently had a bidder who won two auction items

I sent an invoice with combined postage the bidder paid and I processed order and marked as sent

Immediately after this I recieved  a message from buyer telling me to refund postage because it was free

I replied saying to check the original listing of items and you will see there is a charge for postage and not free

buyer follows  up with another message and pictures of my listing

looks like it's taken off a mobile phone and there are the items stating free postage on two seperate pictures

anyway buyer cancelled immediately and I contacted ebay to try to get an answer as to why free postage was showing on these two

items

by the way of a list of about 40 items seems like the only two with the error were the two purchased by same buyer

ebay could not see the pictures buyer had sent through my messages and denied any fault on their part

I would think this might be a little scam  men but buyer has a good  track record 2

any ideas as to how this could happen