Property management playing games!

[Sharad Reddy]

We were renting and our lease was set to expire Mar 8. We asked the property management if we could leave a week earlier and not have to pay a weeks rent. They agreed to this. We were done Mar 2 and sent them an email, if they would like to get the keys ( 2 reminders in fact on Mar 2 and Mar 3). Never got a response to either of them. They did a walkthrough and got the keys on Mar 8. No delay from our end. Now, they are saying that we did not return the keys on time and they are keeping a week's deposit. What legal recourse do I have? Property is in San Jose, CA.