Real Estate Law
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Under Texas law, the property manager is required to turn those funds over to you. There does not seem to be any reason for them to withhold or offset payment to you in the question as you stated, so under Texas law, they are required to pay you.
Since the amount in question is $600 you are within the permissible limits of the Texas small claims court, so I would suggest that you file a suit in small claims court to recover the $600. When you win, the property manager will also have to pay your filing and court costs in the small claims suit.
Here is the background information and link to the official forms that you will need. The suit should be filed in the county where the rental property is located:
Please rate 4 or 5 and close out the question. Good luck to you. I wish you all the best.