Tex. Utilities Code § 141.008

(a) A distribution system retailer that receives a written complaint shall promptly and suitably investigate the complaint and advise the complainant of the results of the investigation. A distribution system retailer shall keep for at least three years after the final disposition of each complaint a record that includes each complainant's name and address, the date and nature of the complaint, and the adjustment or disposition of the complaint. A distribution system retailer is not required to keep a record of a complaint that does not require the distribution system retailer to take specific further action. A distribution system retailer shall notify each complainant of the right to file a complaint with the commission if the complainant is not satisfied by the distribution system retailer's resolution of the matter.

(b) On receipt of a written complaint from the commission on behalf of a customer, a distribution system retailer promptly and suitably shall investigate and notify the commission and complainant of the results of the investigation. An initial response must be made not later than the third business day after the date the distribution system retailer receives the complaint electronically delivered to a minimum of two electronic addresses designated by the distribution system retailer. A distribution system retailer shall send a final and complete response to the commission and complainant not later than the 15th day after the date the complaint was received, unless the commission grants additional time before the expiration of the 15-day period.

(c) The commission may impose sanctions on a distribution system retailer if, after an investigation, the commission determines that the distribution system retailer has violated Section 141.003. Sanctions may include:

(1) adopting an order requiring a distribution system retailer to refund the amounts of any overcharges to the distribution system retailer's customers;

(2) drawing down all or a portion of the financial surety for the purpose of refunding the amounts of any overcharges to the distribution system retailer's customers not refunded before the 61st day after the date the commission orders a refund; or

(3) adopting an order setting rates and fees for the distribution system retailer in accordance with Section 141.003.