Fund recovery scammers usually contact their victims through text messages, letters, emails, phone calls, or online social media sites. Whatever be their communication channel, they communicate with you out of the blue. They usually have a lot of information about you.
They pretend to feel sad for your stolen money and sympathize with you for your loss. They will inform you that they have expertise and experience in dealing with these types of scammers. They will get things done lawfully and ask for an upfront fee. Remember, under the law, they cannot ask for money (fee) seven business days after item delivery or providing services.
The payment they usually ask for is in the form of a gift card, wire transfer (Western Union, MoneyGram), cryptocurrency, etc. Better check for reviews or search for names online on the government portal.