You can go to the local courthouse and they may have the forms. You will have to follow certain procedures like the 10 day notice in order to obtain a valid subpoena. An attorney is probably a best idea because if you make a mistake the material obtained in the subpoena would be quashed and you wouldn't be able to use it in Court.
Looks like the California Tax Board was able to levy money against your account because the social security number and name matched the levy. You should first try to correct the situation and then find someone at the bank who could reverse the fee if you were correct that it wasn't you.