Extend Pet Health Ordered sample of joint health product- Now being charged monthly for product I didn't order Silver Springs Neveda

I ordered a sample of this company's joint care on a Facebook page for $4.95 and I'm now getting a monthly supply every month for $69.95.  I am having trouble connecting with this company to ask them to quit sending me product and charging my card.  There is no phone number or email address on their invoice (also, no dollar amount so you have to go to your charge card to see what they're charging you).  I found the website.  Have not been able to connect with them on the phone.  I'm trying their email address, but after seeing the other reports I will also disallow the charge on my card.  That should get their attention.