Has anyone heard of 'Grant Financial Network, Inc'?

This grant writing company solicited us, and I fell for their tactics. Now we're out $2500, with a promise of a grant for $100,000 at which time we pay an additional $2500. It's been since March that they've had our money. It's too late to tell me I'm naive; I realize that already! But they sounded legit, and even the accounting firm we are currently using said "Oh yeah, we see small businesses get grants all the time." I'm specifically interested in knowing if anyone else has had any experience with 'Grant Financial Network, Inc'. Thanks!