I word my "Why did you open a chargeback" mails the same way, and offer to handle things via a refund (and to please close the dispute because it affects our business). But the people who use their credit card company instead of email or the prominent Cancel button on the website don't tend to ever respond to those mails.
It's frustrating, because so many people have had to deal with health clubs and Comcast that they just assume every business will fight against them if they want to cancel.