I can't see anything you've bought since 2010 so either it was a Private listing or you used another id.

If the seller is new,they probably had no idea how to choose the option of Local Pickup only so chose free postage thinking it meant the same thing-just guessing here.

If the seller is experienced,then they probably used free postage to put their item higher up in the searches.

Either way,if they refuse to post,there is nothing you can do to force them.

Simply request an immediate refund,leave appropriate feedback & move on.