This situation is occurring in Utah, USA.
I rented a unit to a young couple in the middle of January this year on a month-to-month contract. They paid a full month rent and the prorating was going to come in February. They lived there for only a few days, then gave a thirty day notice. They paid the prorated rent for February since they gave their thirty day notice at the end of January, but apparently a manager told them that we'd refund their prorating if we could rent their unit for the month of February.
They contacted me today saying that their deposit check was late (an internal issue; their thirty day notice wasn't filed), so I'm getting it sent soon. They also said we owed them their prorating back if we were able to rent their unit to another tenant. We did get another tenant into their unit at the beginning of February, but do we legally owe them their rent back? Can they prosecute for us renting a unit that belonged to them?