Investigator said they received voicemails from me about mediation... I didn't call.

Trying not to freak out with worst case scenarios... I at least know that, as long as I formally state that I did not send those voicemails, I am protected. I also understand that this could have been a clerical error... But I can't help but worry that I am being sabotaged.

I initially casually said that the claim that he has voicemails from me was alarming... To which he responded that, if I am concerned about identity theft, I should contact local police. So, in order to establish whether this was a mistake or fraud, I asked the investigator to offer what dates or times those calls came in, and asked whether it was my name that was being stated. The investigator responded "I don't have further information for you at this time. Please stop asking about the voicemails." without giving any further details. Maybe he's too prideful or worried about getting dinged by his supervisor to address whether he made a mistake.... but his response was entirely unassuring and sloppy, so I am here ruminating about it.

Is this sort of confusion typical, or should I be worried about impersonation?

To note: I have had ALL my personal info leaked in recent breaches, which makes me more paranoid about this. Also, the employer I am reprting discrimination against is notoriously brash and abusive and loud and probably not very smart so I wouldn't doubt that they would do something so stupid as impersonate me.