I once received an invoice from AVDATA for a landing at Bankstown by my Tiger Moth, which at the time was in a hangar at Murwillumbah with its wings off, undergoing maintenance.
I wrote back explaining the facts and pointing out that the only way the charge could have been incurred was if someone had snuck into the hangar during our lunch break, refitted the wings and flown to YSBK and back in an hour.
They wrote back demanding payment.
(I ignored it and they eventually gave up.)