Thank you for your question.
If proper notice was not given, they can be held responsible for paying rent for to the end of the applicable rental period. If they did not give appropriate notice until part-way through October, if their notice was not accepted as compliant with the lease terms, you can hold them responsible for rent through November. In order to give proper notice to move out the end of October, they would have had to give notice by the end of September. Since they failed to do so, the notice they gave properly terminates their lease at the end of November.
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