Tex. Property Code § 5.082

(a) A purchaser under an executory contract, on written request, is entitled to receive the following information from the seller:

(1) as of the date of the request or another date specified by the purchaser, the amount owed by the purchaser under the contract; and

(2) if applicable, the name and address of the seller's desired trustee for a deed of trust to be executed under Section 5.081.

(b) On or before the 10th day after the date the seller receives from the purchaser a written request for information described by Subsection (a), the seller shall provide to the purchaser a written statement of the requested information.

(c) If the seller does not timely respond to a request made under this section, the purchaser may:

(1) determine or pay the amount owed under the contract, including determining the amount necessary for a promissory note under Section 5.081; and

(2) if applicable, select a trustee for a deed of trust under Section 5.081.

(d) For purposes of Subsection (c)(2), a purchaser must select a trustee that lives or has a place of business in the same county where the property covered by the executory contract is located.

(e) Not later than the 20th day after the date a seller receives notice of an amount determined by a purchaser under Subsection (c)(1), the seller may contest that amount by sending a written objection to the purchaser. An objection under this subsection must:

(1) be sent to the purchaser by regular and certified mail;

(2) include the amount the seller claims is the amount owed under the contract; and

(3) be based on written records kept by the seller or the seller's agent that were maintained and regularly updated for the entire term of the executory contract.