If I were you and you firmly believe that someone is using your rego, Avdata should be able to retrieve the recordings which may help you/them identify the perpetrator and subsequently end up as a Police charge of OPBD or similar
I don't believe in my case that someone is using my rego because when I phone Avdata they have me standby while they have a listen to the recording. Every time it turns out that the call sign has been misheard. What I'm bitching about is that with a little bit of care they could get it right the first time. Why should they be allowed to send out who knows how many wrong invoices just so they can process the calls twice as fast. I'm over chasing them to correct their stuff ups so I will take the advice passed on by KRviator and ignore the bill.They can send outstanding invoices till they're blue in the face. I hope they don't print on both sides because I like to print weather etc on the blank side.