I moved to a new town and in my first week I made the huge mistake of parking in Lidl's car park for 20 minutes at 7 pm in order to pick up a takeaway. (Never shopped at Lidl before, although I was planning to until this happened) I genuinely didn't see their puny signs in the dark and was landed with a £90 charge.
I wrote to customer service to explain what happened. I've worked in customer service for years so was basically expecting either the friendly response "we'll let you off this time as we'd really love to see in store" (that's what I would have done!) or the jobsworth response "nothing we can do because [insert spurious reason here]"
Instead they sent me a generic letter telling me to send my receipt to the parking company (the can't be arsed to read your email properly response).