888-588-1923

They called from a Detroit phone number and left voicemail with my maiden name I haven't had in years and said in a robotic voice that I was going to be served papers and do call 888-588-1923 but call came through as 3135693345

This appears to be a "Fake Process Server" scam which is often a lead-in for a "Fake Debt" scam.
There are no letters, papers or documents, no court cases are going to be filed and no assets are going to be seized.

The message they leave is intended to instill enough concern in the intended victim that they will return the call.  The goal of the scammers may be one or more of the following:

• They may just be phishing for personal information, under the guise of verifying your identity, so they can use it for identity theft later.
• They may claim that you need to pay "processing fees" before they can serve the papers.  Payment could be demanded through gift cards, cash transfer apps, or by requesting bank account information.
• The scammers might use this as a pretext to a "Fake Debt Scam" and will claim that there is some outstanding "debt" that they are trying to collect on.  The claimed debt will usually be very old (beyond the Statute of Limitations) and a fairly sizeable sum.  They will offer to let their victim settle the debt for a fraction of that amount and avoid being sued in court if they pay then and there over the phone.  They will be very aggressive and try to browbeat and threaten the victim to make a payment.  They will refuse to give any details about the debt beyond generalizations and will also refuse to agree to send any documents supporting their claim, often claiming that they were already sent at some earlier time.

Relatives of the intended victim and even employers (present and past) may be called in an effort to embarrass the victim into calling the scammers to get the calls to stop.

The best course of action is to ignore the calls and not return any call.  If you have any doubts about being sued, call your local courthouse instead and have them check if anything has been filed against you, you will find the lack of results reassuring.
Remember that if you were really being sued, a real process server would not call you or a relative about papers needing to be delivered, they simply show up and serve the papers.

File a complaint with the FTC:  https://reportfraud.ftc.gov/

Then file a complaint with the CFPB:  https://www.consumerfinance.gov/complaint/

Lastly, file a complaint with your State Attorney General's office.
List of State AG’s offices:   https://800notes.com/faq/attorney-general

Was left a voicemail to call back 8885881923. It came from a different number, which was 5862715312. This seems to be a scam. All I can say is BLOCK BLOCK BLOCK do not call back.

Was called with +1 (719) 370-0078 was told to call 888-588-1923 to discuss papers of pending documents

They called this morning using a recording, then after I said something, a woman came on, asking for my ex-wife by her maiden name. She claimed my ex was subject to a lawsuit and they needed to speak with her directly. (We divorced over 12 years ago and I have no idea where she is now or how they got my number so I knew it was a scam attempt) I asked why and by who she's being sued, without telling her we're divorced. The woman got very angry and said she could only release that information directly to her unless my (ex) wife called and gave them permission. I asked for the company name and address but she just shouted something and hung up.
I had my woman friend call and state she was about to undergo surgery and it would be OK to give all the information to me, her husband. I called back about 15 minutes later and the same woman asked me for my name, birthday and something else I couldn't understand. Probably my SSAN or bank account#. I told her I could handle any legal matters involved since I was a US assistant attorney general. Damn! If she didn't hang up on me! How rude!