An insurer, health maintenance organization, or insurance agent is required to report in writing any violation of §19.102 of this subchapter (relating to Agent Authority to Market Medicare Advantage Plans, Medicare Advantage Prescription Drug Plans, and Medicare Prescription Drug Plans) within four calendar days of discovering the violation by first class United States mail to the Enforcement Division, Compliance Intake Unit, Mail Code 110-1A, Texas Department of Insurance, P.O. Box 149104, Austin, Texas 78714-9104 or by other method acceptable to the department.