Wow, what an entitled OP
This is why I worry about selling on the site, I understand that a mod said to take it here if you have issues but it is just a knife so let it go because you are digging deeper with every post.
I made a mistake in a sales post not too long ago and would have cancelled the deal except for I had already sent the buyer my PP address so that meant that I agreed to the sale. Maybe the seller did the same thing and accidentally sent it to the wrong buyer then pretty much had to go through with the sale once the funds were received.