I would like to close my account but they say they cannot return my money without the documents. I have a couple hundred euros there do I would not want to leave them there but the notarization will also cost a lot.
I'm aware of such problems with Mt. Gox but I'd like to ask those who have been in the same situation, what did you do? Did you finally pay for the notarization?
What you've been doing is probably against MtGox ToS. They're pretty strict about AML requirements and if your transactions have been flagged as suspicious they can ask you to verify not only your identity but also the source of the funds you're using to trade. Representing transactions as your own when they're actually being made on behalf of others is a pretty big AML no-no.