This is blatantly false. I have no idea whether you know that or not as it's 50/50 as to whether you do know that, but are just being deceptive, or whether you are simply just dumb.

There are plenty of jurisdictions in which promises made in correspondence or verbal agreement can be considered a written contract with or without a signature. And in the jurisdictions where it's not considered a "written contract", it can still be considered implied, and so you would still receive a red flag on this forum.

Arguing over the nuance of whether or not the contract was 'written' rather than as to whether or not you scammed him shows how much of a low-life you are.