First National Collection Bureau harassing me

This sounds like a scam. To be sure, rather than just checking the court website, call the court and ask if a law has been filed against you or a judgment issued against you. I doubt you have anything to worry about. In fact, I would block his number.

You could send a cease and desist, but callers like that would probably not provide a valid address, nor would they abide by a cease and desist. They don’t care about the FDCPA because they cannot be located in order for consumers to sue them.

Do what Vntrsc has said.

You can take other steps as well:

Stay at home and drink lemonade.
Block the phone number of this guy.
Focus on important things in life.

This is a total scam. Will you be receiving stimulus checks by any chance? Scammers are targeting those people who are likely to receive stimulus checks. Report the matter to CFPB if they continue to harass you.

I was studying a legal website. The website has claimed that FNCB or First National Collection Bureau is infamous for such notorious acts.

They regularly violate the FDCPA act and try to collect taxes from people who do not owe anything to them.

Yes, you can send a Cease and Desist letter to them asking them not to call you again.
The FDCPA Act is empowering you to do so.

Make us informed about the next incidents.

Ryan Miller, in order to send a cease and desist, one must have the address of the collection agency. Scammers don’t usually provide valid addresses.

I agree to vntrsc, block the number or inform your state's attorney general.