after a few hours exactly 6 hours after purchasing the account (hero and legendary) when I tried to login the account didn't work
What does it mean "didn't work"? Did you change the passwords?
Why would you send $8100 for just mere Bitcointalk accounts?
It has to be one of the worst investment moves you made here. I hope you realize that now.
I can see how someone could potentially consider it worth it if both accounts are in high paying campaigns but this whole story smells like cow poop. Even if it's true, I doubt that OP bothered to verify whom they're dealing with. A truly "trusted third party" was probably not really trusted.