The Department shall give notice of each violation to the customer committing such violation as follows:
a. If the penalty assessed is limited to the surcharge described hereinabove, by enclosing with the billing on which said surcharge appears a written notice of the violation.
b. If the penalty assessed is, or includes, the termination of service to the customer for any period of time whatever, notice of the violation shall be given in the following manner:
(i) By giving written notice thereof to the customer personally; or
(ii) If the customer be absent from his place of residence and from his assumed place of business, by leaving a copy with some person of suitable age and discretion at either place, and sending a copy through the United States mail addressed to the customer at either his place of business or residence; or
(iii) If such place of residence and business cannot be ascertained, or a person of suitable age and discretion cannot be located at the premises, then by affixing a copy in a conspicuous place on the property where the failure to comply is occurring and also by delivering a copy to a person there residing, if such person can be found, and also sending a copy through the United States mail addressed to the customer at the place where the property is situated.
Said notice shall contain, in addition to the facts of the violation, a statement of the possible penalties for each violation and a statement informing the customer of his right to a hearing on the violation.