My question involves landlord-tenant law in the State of: California

Hello,

Upon moving into my apartment complex last year, we were post-poned our move in date due to our apartment not being ready (replacement of carpets, painting of cabinets and other maintenance issues). We moved in the first week of August and did not think anything of it. Apparently the manager of the complex at the time did not change our move in date to the first week of August, she left it as July 25th, 2013. Because we put in our 30 day notice July 1st, 2014 (thinking that we had until the first week of August to move), they are charging us a prorated amount from July 25th to August 2nd. We have been in contact with the old manager since she is not longer there and she has sent emails to the regional manager of the complex stating that we did in fact not move in until the first week of august and that our lease should have ended 07/31/2014 not 07/25/2014. The regional manager replied in the email to our old manager that she would take care of it. However they have not and are still trying to charge us the pro-rated amount. We have the carpet receipt of when the carpets were replaced to state that we did not move in obviously while carpets were being replaced. We also have a statement of the first cashiers check that shows an August date. We are pissed off because one of the current managers who was here when we first moved in and stated that he remembers we moved in late a few weeks ago is now saying that because we are in contact with the old manager and now have made "relations" with her that we are making up and lying that we moved in the first week of August (EVEN THOUGH HE TOLD US A FEW WEEKS AGO HE REMEMBERED WE MOVED IN LATE)..

Help what legal standing do we have...

Thank You