No one can guarantee that you can solve the case, so you can only give it to the police uncle. Your personal ability to deal with liars is very limited. Most of this kind of fraud is cheating by wearing someone else's vest (using the name of a registered company). It is a common feature of fraud to use personal bank accounts (so-called legal persons and financial leaders) as collection and charge accounts. However, these accounts are usually not in the name of the liar, which makes it more difficult to solve the case.