United?? Is this a scam agency?

I received a voicemail from a Stacy Mitchell who stated she worked for the State of New York in the Summons office and she was calling me because by law she had to notify me that I was about to be served with papers. If I wanted to avoid this to call 1-855-847-2682 to speak with the client. Immediately after leaving that message the same girl calls my parents and asks them where I am. My mother told her she didnt know and the girl persisted saying if I didnt pay this debt I was going to court after being served papers at my home or work. My mom said "then why are you asking me where he is if you already know his address". The woman then hung up.
So, I called the number and the automated system said "United" and I got transferred to a Lisa Simmons who started yelling at me that she wasnt a collection agency and stated she had my IP address and bank account number and that I was going to court if they did not resolve the issue today. She said "I am not a collection agency, I work in the state office that issues the summons". She told me that by law she can call me all she wants and also call relatives and my place of employment. She would not give me any information such as an address to send a Debt Validation Letter. I asked her to send a Dunning Letter and she said she didnt have to do that as she is not part of a collection agency. I said then why did the automated system say "United". At that point she hung up on me. I reported this to the FTC already.
Anything to worry about??