I subscribed for one month to a Landing Page service called Instapage.
I needed such a service for one month only. At the end of the month I was duly notified by one of their agents, via an email, that my account was going to be deleted. To my horror, 3 months later, I discovered that they kept billing me every month, for about 4 months, without telling. Also on their web page there is no information whatsoever about how to quit their service. I had to open a ticket on a very lame help page.
They answered to my complain saying that they were referring to my "free account", but that they kept billing me. Of course this was not clearly mentioned on their "cancellation" e-mail.
Bottom line, don't trust them. They are the worst. Do not trust them