I have never heard of a book of complaints. You can swear out an affidavit as to your past actions, and with whom. Your best bet is to send a certified letter and one by regular mail. That way you have proof of mailing and you can testify that the one sent by regular mail was not returned in case they don't pick up the certified letter.
Actively practicing law in Texas. Inactive licenses in Arizona and Georgia. All answers are general in nature and no attorney/client relationship exists in this forum.