The gist of the story:
Call 800-444-9491 and just be nice and say that what they doing is illegal and that they had no authorization to charge the credit card. No signature can be applied from a different purchase. If they give you any garbage just say that you want to speak to someone above them. I eventually spoke to someone named Jenny who told me they were going to refund all my money. I recommend calling this number first, not the 800-355-1837, they have no authority to do anything other than give you back the last two payments.

My story:
After placing an order for ProFlowers.com back in May of '08, a pop-up came up offering discounts off my order, I clicked on it and was shown a long form to fill out. I decided I didn't care enough and so I closed it and finished my order for Proflowers and left it at that. About a month later there was a charge of $1.95 to my credit card under the label Easy Saver. I called the credit card company and they said it was an addendum to my proflowers order. I assumed it was some stupid fee for delivery or something like that, so I let it slide and forgot about it. Then in September I looked at my credit account and there was a $14.95 charge from Easy Saver. I knew it sounded familiar so I started going back through my records and they had charged me this amount for the last several months. I completely missed it among the other purchases I had made. I called the 800-355-1837 number but they could only remove the last two months of charges. Then I came to this site and found another number that I HIGHLY RECOMMEND calling first. Call 800-444-9491 and just be nice and say that what they doing is illegal and that they had no authorization to charge your credit card or other account. I eventually spoke to someone named Jenny who told me they were going to refund my money. I would recommend this route.