i would demand my money! youve basically paid them £75 to clean their windows!
i wouldnt have coughed up for the window either, its their fault you slipped. i would have rather be down £15 or lost time, than £75.
£15 x 12 = £180 a year I would have as you say coughed up as it was a mistake made by the guy, I would rather be £15 or £75 down, bad words that stick and get around fast. in this game name means alot on word of mouth, upest soemone once they will always talk about you in a bad light this costing yuo far more than £15 and or £75