A lot of times what happens is people accept a free trial for a product, like anti virus etc, and forget to cancel and it auto renews. Be careful what you are accepting.
Check if you had a subscription set up and cancel it. Click on the profile tab (icon next to log out) > Click on payments third option along on the thick blue band top of page > "manage pre-approved payments.''
Advice is voluntary. Kudos / Solution appreciated.
