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What do you mean - when did you leave the apartment or leased premises?
Why did you pay in September?
Did you pay a security deposit?
You each have to give one full months notice before vacating or asking for possession. Therefore, if you left in anytime during the month of September - you still owe for October.
After you leave - if you give him written notice of your new address - he has 30 days to forward you your security deposit and/or a statement of expenses as to the balance of the security deposit if it wasn't all refunded.