HELP FISH!
The debt collector use scare tactics e.g. threatens to hit you with a lawsuit if you don't make a payment right away, he could be a scammer.
You must request verification for the debt, the debt collector has to provide you with proof of the debt and proof they're authorized to collect on the debt
They don't give you their company's contact information. Real debt collectors should be willing to give you the name of their company, their phone number, and their mailing address.
One way to check whether a debt collector is a scam is to search the internet for their contact. Often, you'll find web pages where other consumers have commented on the debt collector and the business they collect for.
Don't provide any information of you, they should already have. Not every debt collection scam aims to trick you into sending payment for a debt. Many are seeking personal information they can use to commit fraud or identity theft—a process known as "phishing.