How can i get money back from a scammer?

You can file a police report. But it is likely impossible for them to do much if anything if this was an online scam.

A phone scam or a postal mail scam may offer the police more opportunity to take some action, but online scams are typically impossible to trace and more than often or not the scammer was not even in the same country you are.

You generally can’t … any more than if you had handed him/her CASH.

You can report it to the police.