unknown/unwanted

I got a call from thisnumber from a guy named "Dennis" who didn't want to give me his name, company, or actual phone number even with threatened with legal action.

I am not in debt, and they claim to be from a debt coonsolidation company wanting me to consolidate my debt with them, but REFUSE to give me any information about their company!

I tried to ring back this number and it says it's "disconnected", IE, a fake caller ID identity.