I can imagine that they'd be reasonable if you notified them promptly that the equipment wasn't working (ie. before you get caught by the camera car). A week later when the ticket arrives in the mail? Probably not so much.
Hindsight is 20/20, but being able to pay by text message is really handy and I'd recommend it to everyone. I just text the code in while I'm walking to where I need to be and I don't bother with the machines.
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