(1) The letter accompanying a telecommunications utility rate case filing to the commission shall contain a minimum of the following:

(a) A list of documents submitted with the filing;

(b) A list of names and addresses of those to whom copies of the rate case have been mailed;

(c) A brief description of the proposed changes in service, rates, and revenue levels;

(d) Reasons for the proposed changes;

(e) Estimated number of customers whose rates will be effected;

(f) List of names and phone numbers of utility employees or consultants who shall be responsible for answering questions concerning the rate case;

(g) List of names and addresses of utility employees or consultants who should be included on the service list.