They said I needed an additional .6 btc to reach the "3 hour window" limit, so I stupidly paid them another .6.
These guys are either scammers or just complete morons. Either way, It looks like we're screwed.
You sent your btc to people after a forum thread already said they were scammers.
Then they asked you for more btc which you also sent.
And now you're unsure which set of people are scammers and which are morons?
You may need to step away from the Internet.