We, too, check our credit card account, on line, regularly and found a $99 charge from HDI Co. I had to research the name through BING and found this page. We had ordered an item from the Company Store and had an account number and phone number. I called, spoke to an agent, who explained about something called a Buyer's Edge Program, which cost $99. When I told her we had not ordered such a program I was transferred to Customer Service, where an agent, Lucas, said he would arrange a refund to our credit card.
It is all very disconcerting and reinforces the need to carefully review credit card charges.