The Corporation shall mail all bills on or about the 24th of the month. All bills are considered the responsibility of each person signing the Service Application and Agreement Form. All bills shall be due and payable upon receipt and are past due beyond the date indicated on the bill (allowing approximately fifteen (15) days to pay,), after which time a penalty shall be applied as described in Section G. A bill is delinquent if not paid on or before the past due date. Final notices shall be mailed allowing ten (10) additional days for payment prior to disconnection. The ten (10) additional days shall begin on the day the final notice is deposited with the U.S. Postal Service with sufficient postage. If the past due date for the regular or final billing is on a weekend or holiday, the past due date for payment purposes shall be the next day the Corporation office is open for business after said weekend or holiday.. For all disputed payment deadlines, the date postmarked on each bill wil determine the beginning of each billing cycle or final notice mailings.