How about every charge they pass you after you contact them in any verifiable way (including submitting a support ticket to their website and taking a screensho

How about every charge they pass you after you contact them in any verifiable way (including submitting a support ticket to their website and taking a screenshot, sending their support email an email, or writing a letter) requesting cancellation they have to pay back to you triple. Then the ball's in their court. You're happy to let them keep charging you, it's an investment. I bet that would get them off their asses.