This company treated to put me in jail if I didn't pay right then they couldnt tell me who they were

Debt is civil, not criminal, so no one is going to be jailed for failure to repay a loan.  They threatened you with jail - first red flag that you were targeted by scammers.  They couldn't or wouldn't tell you who they are - another red flag.  And taken together - the threats and refusal to identify themselves - these are violations of the FDCPA.  More info here on similar scams:

http://800notes.com/forum/ta-86217073a9c8dad/ ... 077595690349410
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http://www.consumer.ftc.gov/articles/0258-fake-debt-collectors
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http://www.deadiversion.usdoj.gov/pubs/pressreleases/extortion_scam.htm
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Also read up on the laws and your rights:

http://800notes.com/arts/Jb8EW-eDhQA/harassin ... ou-need-to-know
http://www.ftc.gov/os/statutes/fdcpajump.shtm
http://www.consumerfinance.gov/askcfpb/search ...
http://www.consumer.ftc.gov/articles/pdf-0096-fair-credit-reporting-act.pdf
http://www.consumer.ftc.gov/articles/0149-debt-collection
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Follow the steps in what you need to know. A legitimate debt collector agency should not have a problem with giving you a real business name and address you can google and verify via google street view, BBB etc.
For extortion Scam Operations, file reports with the FBI, your state attorney general and Department Of Justice,FTC & FCC..

http://www.nw3c.org/
http://www.ic3.gov/default.aspx
http://www.fbi.gov/
https://www.ftccomplaintassistant.gov/#&panel1-1
https://esupport.fcc.gov/ccmsforms/form1088.action
http://www.consumerfinance.gov/complaint/

And folks should consider looking at maybe getting call blocking device or phone..
http://www.amazon.com/s/ref=nb_sb_noss?url=se ... s=call+blockers

Received a call saying a warrant is being issued for a family member for returned checks.  When asked for information about the company he was calling from, he got beligerent saying "I don't have to tell you anything.  I'm not the one in trouble."

Don't give out any information to this scammer.

Got a call from this number 832-742-4320 also. The man claimed to be from the Fraud and Worthless Check Division out of Texas and that he had a warrant for my arrest for a worthless check or that he was going to file charges with the local district attorney's office for fraud. I told him I never write checks. I have a checking account, but I do not write checks and that he must have the wrong person. He said he did not have the wrong person. I asked him who was I supposed to have written the check to and how much and he could not give me any info. He then threatened to come to my place of employment to have me arrested or serve papers for me to appear in court. I told him to come on. I would be waiting. Then I told him if he called me one more time I would seek an attorney and then let's just see who gets served with papers. He hung up. Don't know who they are, he was unable to give me any information on where they were located or anything. It's a scam, people. Do not give them any info.

When these foreign criminals call again from the 'worthless check division' ask him if he's the head worthless. You don't want to talk to the junior worthless, only the top worthless will do. Then ask him how's the weather in Mumbai today?