Do this with Teamviewer, without formally terminating the account, and they'll chase you for it, including passing your case on to a legal firm ( at least, here in Australia they did )
I sent a fairly polite letter back explaining id long since stopped using the product, and all they were doing now was destroying any residual good will they had. I never heard anything back.
Amen to this. It's a pain as a seller, but it works out for them because I use PayPal whenever possible on a subscription requirement solely because of this.
Hah, this is exactly how I ended up "unsubscribing" from the NYT. I first migrated my subscription from my credit card to my paypal, then used Paypal to block the payment. They then spent the next week sending me half a dozen emails begging me to re-enable payment, which I marked all as spam in Gmail.