The prior answer is essentially correct, but for one thing: the statute does not actually require your demand for itemization to be in writing. (Undoubtedly an oversight, but the language says nothing about written demand.) Written is better, but even if you simply gave the demand orally, you can go forward with the treble damage action. Since the common belief among LT lawyers and judges is that the notice has to be in writing, you might want to do a written demand anyway. But that tips off the landlord to his oversight. Get a lawyer.
First, the 14 days starts to run after the landlord receives written demand from you for return of your security deposit. If you have done this, you are at the point where you need to hire a landlord-tenant attorney. Many offer free consultations. You should also contact collections and find out what the landlord says you owe. This information may be helpful to your attorney.
Please note that I am answering this question as a service through Avvo but not as your attorney and no attorney-client relationship is established by this posting. An attorney-client relationship can only be established through signing a Fee Agreement and paying the necessary advanced fees.
I agree with the prior attorneys' answers but you need to be aware of a few issues to discuss with your landlord tenant attorney. 1. Did the manager have authority to accept a late notice? This may be answered in the language of your lease. 2. What are the amounts of your refundable deposits, not just all of your deposits? Treble damages is only for what amounts you should have received back from your deposits. 3. What amounts are you being collected on? If you have a thick skin, feel free to try to have this conversation with the collections agency to get the details. 4. If you are looking for an attorney and you are having difficulty, you may want to call the Maricopa County Bar Referral Service.
Disclaimer: This answer is provided for informational purposes only, does not constitute legal advice, and does not create an attorney-client relationship. I am licensed in Arizona and can only provide general comments on matters outside of Arizona law. Actual legal advice can only be provided after a direct consultation in which all of the relevant facts are considered before providing a response.