I got the same thing she put me on hold for 30 seconds and came back saying that the Plaintiff wanted half and that they would be issuing a warrant at 5:00 today

I received a call from this number telling me I had a pending case going to court and if I did not pay almost $900 dollars I would get arrested and go jail because the police would be arresting me.  They refused to give any information on the case, court location etc.. they refused to give me their address or a supervisor. They were very rude and persistent.  It was hard to get a word in when speaking to the lady. I am very concerned and don't have any information what so ever. Is this a scam ? I researched the name of the agency but could not find it.

They have violated the FDCPA several times:
Refusing to give information
Threatening arrest/jail
Pay now or else
Telling you if you do not reply you waive your right to council

The above are illegal SCARE TACTICS!!

IF you really were getting a court summons, you would NOT be notified first.  Phone calls, faxes, texts & emails are NOT an official notification per the FDCPA.
Demand written proof of the debt that is mailed to you.  They then have 5 days to comply.  Expect excuses and probably more threats.  Nothing in writing & mailed - no notification.
Contact your state attorney general.

Agree with MJG.  This is an old scam.  Group of white collar criminals going around threatening arrest on civil debts which is highly illegal and in violation of FTC rules. Being in ordinary civil debt is not a crime and you cannot be arrested for it.

Report them:

http://www.consumer.ftc.gov/articles/0149-debt-collection  (Threatening criminal prosecution to collect a civil debt is a clear violation of the Federal Fair Debt Collection Act)

Also contact your local attorney general

If they continue to bother you, and you know you do not owe any money,  tell them that you know this is  a debt scam and that you are making a complaint to the police for extortion.  You might have to yell at the scammer and talk over him or her.  Once you get a copy of the police report and they call you again , just read out the  file number and the name of the PD or Sheriff’s office involved.   Tell them you’ll be glad to send a copy to them at whatever address the jack***es are working out of now.  IF you can find them.  Nobody really knows where they are located.

They were threatening me that if I didn't pay the full amount of $717 I would be issued a warrant at my county jail.