Caller showed up as 'Private Number', so I let my machine answer it. Caller left a message for 'Albert McCain' (someone that has never lived here), with instructions that he needed to call 'the company that has enlisted our services' at 213-915-4696 within two hours in regards to delivery of some 'legal papers' that someone had 'declined to sign for on [Albert's] behalf.' Left a 'case number' of 742-096-19PA, which I assume is to make the target think it's a legit call.
This just happened to me, too. I called back and they had my SSN and birthday. After doing some digging, the "law firm" they work on behalf of is a bunch of BS. This is a scam. Spread the word!