I'm sorry that happened, and sorry for all the past history that has made this so upsetting for you.

But...if you file a complaint, it will be dismissed. Look at your state's licensure database and see what therapists get disciplined for. Sex with clients. Inappropriate dual relationships. Insurance fraud. Missing one appointment is bad, but it is not a matter for discipline.

I'm saying this not to say you're overreacting or wrong - I'd be majorly PO'd if it happened to me - but if you file a complaint and it gets dismissed, it will make it even harder for you to seek help and trust any mental health provider you might see in the future. You will feel the whole profession is against you even more than you do now.