I know how it feels:
I had a Shortsale listed, and my Client called me in; He had a proposal from one of those companies: They promised him to save the house by forcing the Bank to modify the Loan.
I cautioned him to not give them any money up front. He ignored my and gave them $1500, I cancelled the Listing and removed my sign. He told me a month later that it was all a scam. No apology, no Listing, no Sale. The Bank Foreclosed.
Every night, I go to bed, and I pray for a Client who will LISTEN to me.