Never EVER use Dreamhost

Dreamhost is pretty bad. I work with a web design company and we always hate it when clients have dreamhost. Their file manager sucks so you can't bulk edit. Additionally, their server response time is terrible, which makes editing with CSS very difficult because you can't see your edits for like 15 minutes.

Did they mention any reason why did they disable your account? If something happened like breaking their TOS, that maybe a good reason for them to do so. But they should have at least warn the user or something. the best thing you can do now is to take actions on them, contact their support, maybe you can still retrieve your websites. or much better, your account.