Mine was by credit card. I called the support number, got picked up quickly, told them I didn't have enough time for it and wanted to cancel. I also made it clear that I just wanted to cancel my newspaper subscription, not my crossword subscription, and mentioned that I realized I would no longer get 1/2 off on the crossword puzzle subscription.

He cancelled the newspaper subscription, and then told me that I was mistaken about no longer getting 1/2 off on the crossword puzzle subscription. I'd only go back to full price on that if I let it expire and then re-ordered. As long as I have the subscription on auto-renew and those payments go through, it will stay at 1/2 price.