Tennants breach of lease..possible property mgmt issues.

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I have a rental home in which tennants signed a 6 month lease. They moved in August 1st in which they paid August rent of $1600 as well as a security deposit of also $1600.

Sept comes around and no payment...after leaving it the hands of my property manager, she finally concluded in the 1st week of October that the tennants are deciding to get up and move. I guess the tennants assume that their security deposit covers the September rent that they've never paid?? This does not seem right to me that they think their security deposit makes all well and can just get up and leave.

My PM notified me that she would bill them for the 1st week of October, any neccassary cleaning/damage, and report them to the credit agency.

What legal advantage do I have and should I take here? As much as I trust my PM, I'd like to have confirmation that things are handled to the full extent and would like documentation of the credit agency submittal. Is this request feasable? I feel I am entitled to more. This is my first rental so any other advice would appreciated.

Thanks