process servers would NEVER call you before they come out. this is a false statement and illegal to use in debt collection. file a complaint with the NYS Attorney General by using this link: https://forms.ag.ny.gov/CIS/consumer-complaints.jsp
I blocked another number from this "company" - who never tells their name which is fishy itself - then they called my dad's phone! I got a call today from a different number, same area in NY but I'm in CA and my number is NC number, with the same threat message saying they would contact my employer to serve me.