39 Miss. Code. R. 1-11-100
Informal complaints may be made by letter or other writing addressed to the Commission. If, in the discretion of the Commission, such a complaint warrants it, the matter presented will be taken up with the utility involved in an effort to bring about satisfaction of the complaint without a formal hearing.
No specific requirement is made as to the form of an informal complaint, but in substance the letter or other writing should contain the names and addresses of the complainant and the person complained of, a clear and concise statement of the facts involved, and a statement of the relief requested.
The informal complaint has been found to be effective in many cases and is recommended. However, in the event of failure to bring about satisfaction of the complaint because of the inability of the parties to agree as to the facts involved, or from other causes, the proceeding is held to be without prejudice to complainant's right to file and prosecute a formal complaint, whereupon the informal proceedings will be discontinued.
39 Miss. Code. R. 1-11-100