['This magazine just charged my credit card when I had cancel my subscription.', 'Thats horrible, how could they get it wrong?', "I don't now, but I hate when they do that, now I have to call or write and lose a ton of time solving it."]
They should pay you for the time you spend on sorting it out.
I was charged by a subscription magazine, even when I cancelled my subscription a month ago.  Now I have to call or write to them and lose a lot of time.