If this was a mutual mistake between you and the landlord, the agreement may be voidable, which means that the landlord may not be bound by the mistake.
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You would need to file in the Tarrant County Probate courts. The phone number for the Probate clerk is 817-884-2840.
Here is a link to the "Community" page of the Tarrant County Bar Association website. It has links to information about lawyer referrals and pro bono services. http://tarrantbar.org/FortheCommunity/tabid/207/Default.aspx The TCBA telephone number is 817-338-4092.