Not a new problem
We have received landing fee accounts for airfields in eastern states when the aircraft concerned hadn't even flown further than the Darling Range (the range that runs parallel to the coast just east of Perth).
Have even sprung an aircraft at Rottnest using one of our callsigns or the one that really makes me laugh - using the old "Cessna 182 downwind _ blah blah blah". I normally get hacked off with it and jump on the radio after said aircraft lands and make sure his callsign has my voice stamp on the Avdata tape.
Then there's even the case of a certain pilot who used to like sneaking into Jandakot after tower hours, under the circuit to use the non duty rwy and without any radio calls.
The things people will do to save a buck. Wonder what else those same operators try and save on - maintenance perhaps?