Random call - no message left - have blocked their future calls.
Called the number back (after blocking) - it's a Verizion payment center????
Thanks to all who post here on 800 notes!
Yes. I too called back after blocking the number and got Verizon wireless national payment center. No idea why they're calling me I have AT&T. Just blocked their call I'm guessing that they're trying to sell something. Thanks to everybody who contributes to this information