I want to understand some things:
1 - How did you find lvmining.com?
2 - Why have not you been looking for other reliable cloud mining like genesis mining? they may not be profitable but at least they are still reliable
You said you talked to the guy's wife, did she confirm if he was the person you were looking for?
Any help would be appreciated...
report your case to the police and hire a lawyer (it would be more advantageous to hire a lawyer).