Left VM saying "we are calling in regards to a complaint we received, we do need to speak with you or a representative immediately.  If we do not hear from you we will document your file for further review."  General message.  Did not state my name.  scam

No real business name - sounds suspicious

VM stating the same thing as Tracy have stated previously it dies not. State a name if business you call back it just say mediator. It sounds like a scam

After hours robo greeter IDs themselves as "the Mediation Department"-- which is just scammer double-talk for debt collector.  Ignore and block any calls from this number.  If they have a valid debt they can send you a debt validation letter by US mail.  E-mail no good.