If you KNOW you owe no money, or believe the call was from a fake debt collector, please take the time to read this:
http://www.consumer.ftc.gov/articles/0258-fake-debt-collectors
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Please reply to this post, to let us know you read it, or have taken suitable actions to protect yourself.
Initial call was from a "process server" saying a lawsuit had been filed, the sheriff's office was serving me, wanting to make sure I'd be home to receive the summons. They gave me the toll-free number and case number of the company suing me for a very old account. Called them, they had not filed anything, said I could settle out of court. Got second call from a "process server" saying same thing. This is a SCAM. The agent eventually gave me this number and address 8484 Wilshire, Beverly Hills, CA. That is an office building. They are using this address for their scam.
Of course nothing was filed, they would be scared to death of getting anywhere near a courthouse because those warrants for their arrest would be hanging over their heads. That is probably a 'virtual office" which means they simply use the address but can be located anywhere in the world.
Read up on your rights here, get template letters to send and also make a complaint at this government site: http://www.consumerfinance.gov/
Also file a complaint with your State Attorney General's office.
List of State AG’s offices: http://consumerfraudreporting.org/stateattorneygenerallist.php