I had a lady do this to me once - I had an old 66 Buick and I parked next to her, and she came back saying I hit her. She was already parked when I drove up I have a big metal bumper and she's in a 90's plastic-mobile. NO WAY I touched her.

So I'll suggest the same thing you do that I did:

If you think you did something, take responsibility

If you think you didn't do it, honestly, then ignore it, and sleep well at night.

I take responsibility for mistakes I MAKE, but I"m not taking responsibility when I didn't.