AngelaPeb, I'm very sorry to hear that
There is no fee for using the One-Click software, so I find that particularly surprising to hear. However I think I may understand what happened with the free trial.
http://wiki.dreamhost.com/Free_Trial_%26_Registration_fee explains this better than I can.
If you can still log in to your account, please open up a support ticket, so our billing department can see what can be done about those charges. If not, please visit http://dreamhost.com/contact/ and send a message to billing so they can sort this out for you.