Landlord frauded a lease document by copying an old lease with old signatures and signed in new dates what should I do

Landlord frauded a lease document by copying an old lease with old signatures and signed in new dates what should I do

Are you able to prove this? And the other question... how do you know this happened?

So when you move out, and he tries to sue, you prove he did the fraud and win the case

Are you able to prove this? And the other question....how do you know this happened?
Yes obtained a copy of the frauded document. The said contract was in question because I did not reside at the said premises at that time I was binded by a new lease agreement at a different location. The contract was brought up in the selling of the said premises