A lady name Jackie called my job then my phone told her I would take a message then she called back later on and left a message being rude and at the end said you have been served

I got the same call.  This company was incredibly rude.  They did the same thing.  They called my boss too, she called me and that is how I found out.  They also called my father in another state!  Same thing, they wouldn't give me any info on this at all.  I consulted a friend who is a court appointed trustee that has much experience with this type of company and she said they will do anything to get money.  If this is legit then they will get in contact with you the correct way.  When I asked them for an address to respond with a certified letter they refused!  HOw can that be legal?  I want to know more about this company.

Got a call from them all day long they even called my boss today said I'd be thrown in jail and said some lady was on her way to serve me paper unless I paid 200 then 300 the next week I said serve away and then they yelled and screamed and we're very rude and hung up on me

Yep - if they really had a "claim" against you, they wouldn't call you about it - they'd just have you served.  They also wouldn't need to ask your address!  Please do report the caller to the FTC and your state's Attorney General.

called threatening and harassing me about some claim against me. Wanted me to give them my address