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If they were under a written fixed term lease, then they can't get out of it even if they did give you a 30 day notice... That is the point of a fixed term lease...it has a start date and a set end date.
So since they are in breach of the contract, you can use their security deposit not only for damages and cleaning, but also for any delinquent rent until you re-rent the property.
But you need to make sure to send an itemized list of damages and deductions from the deposit, including delinquent rent, within 30 days of them vacating to their last known address, which is likely the rental. I suggest sending it certified mail so you have proof of mailing.
As an aside, in addition to being an attorney, I have also been a landlord for over 26 years...