I have had two completely false and fraudulent construction liens filed against me for work that was not performed. One of the contractors will also not return my $6000 deposit. I paid the other one $20,000 and he's showing no payment and a completely different (unsigned) contract saying I owe him almost $40K. I am elderly, 78 years old, though of sound mind, and I think they believe they can get away with defrauding me. What can I do?