And it being a public service, they generally can't deny you the use of it (at least not 'unqualified', I'm sure there could be some sort of police or court order taken out against people) - but they can specify exactly how you're going to pay for the service.
Also, I'm pretty sure "cancelling" means "forced reissue", not forfeiture of a legitimate ticket or balance.
Also, I'm pretty sure "cancelling" means "forced reissue", not forfeiture of a legitimate ticket or balance.