It's now been more than six weeks since I wrote back to Wilsons/PES, and haven't heard a peep back. I hope I'm not courting fate here, but previously they have responded within a month, so I'm cautiously treating it as closed and have been moving on. But I'm not using their parking places anymore, partly on principle, and partly to avoid any prospect that they try and clamp me for unpaid "fines" (which is pretty unlikely, but like I said I'm being cautious). It's funny, but if they hadn't been so pigheaded about their insistence on payment of their "fine" I would have continued to use their facility. Over the long run they will lose more than the $65 they were claiming.