unbouncepages.com review: I used their free trial, but they started to charge 1

I subscribed for free 30 days trial on the website www.unbouncepages.com. I started to build webpage with the help of this website and everything was fine, but once I checked my account, it turned out that they started to charge me for this trial. It was too early, so I immediately found their contact info and started to send emails. No one replied, and i have no idea how to stop these charges. Please, maybe someone can help me.