(a) the name, address and account number of the customer, the name of the telephone corporation, the telephone number of the telephone corporation's business office which may be contacted to discuss the bill, amount owed for the latest period, the date by which payments for the latest period may be paid without a late-payment charge, the late-payment charge for late-paid bills, if any, credits from past bills, any amounts owed and unpaid from previous bills, and credits and charges which are adjustments to past bills due to service and/or rate increases;

(b) a statement of how the bill may be paid; and

(c) an itemized listing of the services being subscribed to, and their monthly rates. An identification of those services which are not necessary for basic service shall be included with each new customer's first bill, each existing residential customer's first bill after a change in service and semiannually for all customers. New customers will be allowed 60 days to change their type or grade of service, or both, and to cancel any optional nonbasic services without incurring any cancellation or nonrecurring charges other than the original service connection and monthly charges for the period service was used. Nothing in this section shall preclude a telephone corporation from providing pertinent messages and information on the bill, provided such information does not interfere with the presentation of the information required by this section.