(a) The commission may resolve disputes between a retail customer and a billing utility, service provider, telecommunications utility, retail electric provider, or electric utility.
(b) In exercising its authority under Subsection (a), the commission may:
(1) order a billing utility, service provider, retail electric provider, or electric utility to produce information or records;
(2) require that all contracts, bills, and other communications from a billing utility, service provider, retail electric provider, or electric utility display a working toll-free telephone number that customers may call with complaints and inquiries;
(3) require a billing utility, service provider, retail electric provider, or electric utility to refund or credit overcharges or unauthorized charges with interest if the billing utility, service provider, retail electric provider, or electric utility has failed to comply with commission rules or a contract with the customer;
(4) order appropriate relief to ensure that a customer’s choice of a telecommunications service provider, a retail electric provider, or an electric utility that encompasses a geographic area in which more than one provider has been certificated is honored;
(5) require the continuation of service to a residential or small commercial customer while a dispute is pending regarding charges the customer has alleged were unauthorized; and
(6) investigate an alleged violation.

(c) The commission shall adopt procedures for the resolution of disputes in a timely manner, which in no event shall exceed 60 days.