What to do regarding a 30 day notice and pro-rated rent?

Question Details:

I had a verbal agreement with my landlord that if we vacated the property earlier than our written 30 day notice, that they would return our pro-rated check for the month. We vacated within 12 days and now the landlord says they will only return the check if they rent the property by the first of the month. They have signed renters that are not moving in on the first but 10 days later. Legally can I still get my check back? The landlords told us they wanted us out as soon as possible so they could show the property. They met and signed renters 2 days before we turned in the keys and now they are saying they are keeping the check.

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