I would scrape this thing off and park in different lots from then on. All you need is a half of a windshield wiper blade track stuck in to break the seal, and then throw this vulture capitalism cash-grab in the trash bin.
With a small chisel + some practice someone could likely clear a cark park - or several streets - full of these within a few hours (overnight), and render the devices unusable until repaired.
Doesn't seem like a well thought out invention. :/