I think this call may be regarding an ambulance service.  Did you call 911 from your telephone recently?
I got the same call this week with the same message.  I called back & went through the usual recorded messages & decided it was taking up too much of my time.  I think they were looking for insurance information regarding the ambulance service I had received on 1/18.  I had mailed it to them earlier in the week & they probably had not received it yet.

Reputable outfits don't hide out their phone number.  They don't call and insist you call them without telling you why. They don't tell you to call back and then use some reference number.  They will use your name.

If they had a valid reason to contact me, and a valid reason that they are insisting that I call them, well, maybe I'd call.  Maybe.  An outfit not showing their number is a huge, huge red flag.

I don't trust these idiots.  I'm not going to waste my time calling them and waiting on some sales pitch, proving to them that they've reached a phone number that is "live" IE a hot contact that they can harass again and again.  I hope they die in a fire.

Same pattern.  Numerous calls from 000 000-0000 and now after caller ID gave the same 000 caller info., a message was left to call regarding 'transportation services for American Medical Response' with 800 919-9106 number with reference code RTI.  Since no services have been rendered, must be a scam !!!

It is extremely important that I call them regarding my transportation services???? caller id #000 000-0000

I can't block their calls and they call 4-5 times a day with no message left....finally left one message with the number 800 913-9106.  

Received numerous calls from 000-000-0000 with no message. Today, 000-000-0000 called again and left a message they were the American Medical Response and it was extremely important that I call back at   800-913-9106 between 9am and 5pm.. Didn't sound right ..what's with the 000- number?

I got a call from "1 000 000-0000" but the message gave this number to call them back with very little info about who they were.