This part I don't agree with. If it is someone who screwed me in the past or screwed someone I know they get ignored, don't care when they contacted me. Same with someone who is just a general asshole, every website has them.

I am semi-retired and work for myself now. Over the years there have been some bad customers, luckily it is rare but there are a few. I keep them logged in my phone and if they call they get ignored. Life is too short to deal with people who feel they are entitled to everything and everyone should bow to them because they are paying.

That being said this doesn't apply to the original poster, he did everything right and got screwed by someone who doesn't care. He obviously needs to block this person from future transactions.