(a) Service providers shall clearly list all charges and credits on customers' bills, which shall be issued monthly unless provided otherwise by tariff. Local service charges may be billed one month in advance and may be listed as a single flat fee. All toll charges shall be itemized to allow consumer identification unless provided otherwise by tariff.

(b) Credit shall be granted for any call for which a charge applies when the consumer has reported that a wrong number was reached or for that portion of a call the consumer has reported as inadequate for communication, unless there is reason to believe that an adequate connection to the desired party was effected.

(c) Service providers shall require that agents authorized to receive bill payments on their behalf normally mail or report consumers' payments within one business day.

(d) Service providers shall have a representative available for the purpose of explaining charges on bills and to adjust bill errors.

(e) Upon reasonable consumer request, each service provider shall provide itemized statements of charges, if feasible, and if a customer disputes a bill, available call detail bill information shall be provided at no charge. However, requests for detailed bill information normally bulk billed may be provided at an additional charge pursuant to tariff.