If "they" had actually kidnapped your fiancée, demanded ransom & threatened to rape her, you wouldn't be here telling us about it. You'd be in contact with the FBI & they'd be tracking down some people who would be looking at doing 20 years to life in a federal facility.
I'm assuming that you're trying to tell us that the people scamming from this number are making threats of kidnapping or making false claims of fake kidnappings. Either way, you're describing extortion. A nasty crime that carries heavy penalties. The scum doing this are usually operating from outside the U.S. They know that if they're apprehended here, it won't go well for them.
Report these types of calls to your local law enforcement. Contact any of the supposed victims of these "kidnappings" & then sit back & laugh at these ignorant clowns who try to pull these stunts. They're no different than the idiots that try to pull the "sexploitation scams" on the dating sites. Desperate & dumber than domestic turkeys!
Be Safe. Be Aware.
Gunnar