Phishing Scam Warning

I believe I got hit by a debt collection scam but I am surprised by how aggressive it was. It also didn’t have many of the general clues. I got a call from an unidentified number that left a voicemail on my cell and on my work (!) line. 2 different phone numbers recorded with different area codes but both area codes in my state. My spouse (!) also got a call and actually picked up - from yet another different area code but also still in my state. The caller just said they were trying to reach me to serve me a document but wouldn’t give any info. The voicemails told me they were trying to serve me legal documents - I know process servers don’t typically call first but they left a number to the “legal department” so I decided to call it in case it was a legitimate debt issue, albeit one I was unaware of as I don’t have any delinquent debt. When I called they put me through a phone tree for “Lincoln & Associates” - a web search doesn’t turn up anything for this firm. I reached someone who said yes they were trying to serve legal documents - they had all my personal info including my SSN. But when they talked about the supposed defaulted debt it was something I’d never heard of. The second I said as such - they hung up on me. I actually tried to call back and they just hung up again! I only called back as I was trying to get it down that I do NOT want to be called at work - which the FCC in the US allows you to request. By this time I was definitely suspecting a scam and not a legit debt collection - and then on my 3rd call the number said it was not in service! I tried again this morning and still not in service! I’m still a little spooked admittedly - though I know all my public info is out there this was much more sophisticated of a scam targeting me specifically than I have encountered. None of the people who answered the phone had any kind of unusual accent btw - all American sounding. Anyways just want to put it out there for any other folks who might encounter this but also curious if anyone else has gotten such a targeted fake debt scam?