Mortgage Services

Mortgage advice service legit or scam?
I was behind on my mortgage a few months when I began receiving mortgage advice service offers via email. I've seen on TV, a lot of cunning contrivance being done to people who give their money to people who say they're going to help that only never hear from them again. What do I need to check to make sure I am not one of them?
If your mortgage company or a public authority does not provide the mortgage advice, I will not get involved ………. you just lose your money.