With Bitcoin, if you lost your bitcoins to scammers, you can not get it back because Bitcoin blockchain is decentralized, and there is no reversibility for your transaction.

The only way you can get your stolen bitcoins back is submit your report to government, police and wait for their investigation to arrest scammers and possibly return your stolen bitcoins. However, chance for it is very small.

You need many conditions: enough evidence to prove that you are a victim and actual owner of these bitcoins; enough support from government and police; and scammers did not convert stolen bitcoins to other things like using all stolen money for things that can not be recovered back to you.