It's for fines enforcement. The call centre are completely incompetent. They call themselves "Enforcement Officers" so they think they don't have to have good customer service. They don't listen to you. Very rude.

Caller: WA Courts

e-courts WA concerning unpaid car registration fees from 7 years ago when I moved interstate and changed the registration, the different states don't communicate with each other, so I have to provide a plate surrender receipt.

this was a number listed on my phone bill as a call I had made to Perth