These ppl are calling me about my sister whom they are harassing for no reasons

I keep getting threatening, harassing calls from 804-435-5818.  They don't identify themselves or the company they are calling from.

They called me from this number 804-435-5818 and then they wanted me to call 877-671-4302. When I called back from a different number, the lady wanted my name without even identifying the business name. Even when I asked what the business was, she just kept trying to get my name. Finally after getting very aggitaited with her and telling her so, she finally told me the business name. Have not been able to find anyting about Bay Capital Management online.