1 My account has been blocked and I don't know why!
There can be several reasons and they are mentioned in the message you get when you try to log in.
2 How can I unlock my account?
It depends on the reason. If you have been banned because of a behavior only an admin can check this reason and unlock you.
If you have more than one account you are banned because of that. Tell an admin via the contact form all accounts and which one you want to keep or apply for more than one account.
We will NOT check your accounts, so it is up to you to tell us what the accounts are!