So as I see it, not contacting the guy to get his side of the story, but just automatically closing him down is fine. You could not possibly be making a mistake.
Unless you are protecting photographers rights, then you have to soft foot it and be a nice understanding guy.
Imagine dealing with cheating idiots like this 10 times a day, for 6 years and you are in another mans shoes.
I will not mention his name, but it is funny the attitude taken when the boot is on the other foot.
