Discover Bank / Discover Financial Services / unauthorized charges

I have been billed for merchandise and will pay for this one time but I have no way of calling the people and telling I don't want anymore. There is no phone number. Can you help me with this. It is Active-pro-formula. I tried their e-mail or what I thought was their e- mail to no avail. I don't want this anymore and will not pay for it again. So if you all can help me, I would be most thankful.

Jackie Oliver
card# 1413