@Tigge1982, you waste time contacting these people, or maybe it's just one person (less important) - they just want more money from you and won't give up as long as you show any intention of staying in touch with them.

If it is a larger amount that you sent them, you can always report the whole thing to the police, and if you find out where the coins ended up in the case of USDT, the funds can be frozen no matter where they are. What I want to warn you about is that you don't pay anyone in advance for any investigation services, because you could lose even more money.

Maybe someone from the forum could investigate where the coins are, but that would require you to make your transaction public.