i gave up on APCOA▸ (Car parking company used at GWR▸ (Great Western Railway) - controlled stations in the area) to respond sensibly to my emailed complaints (only one of 3 was even acknowledged) and called them
You get what you pay for (except with FGW▸ (First Great Western) where you should get at least 2 journeys per ticket) and i suspect APCOA dont overpay their staff but the net result was that the customer advisor didnt know why they were overchargin me and didnt seem overinclined to find out why. But he did credit me the 40p
on another note i appealed against a ticket i was given in January and refused to pay up in spite of the Roxburghe and Graham White letters. Just after the first Graham White letter (c4 months after the offence) i received a reply to the appeal and, unbeleivably, my appeal was upheld and the ticket quashed. i wonder whether that would have happened had i paid up after one or more of the letters and, if it had, whether i would have got my money back.
Bottom line is that they will huff and puff but won't actually take you to court for non-payment so, if you are in the right, stand firm