PORTLAND, Maine — Maine’s highest court has rejected the appeal of a former Biddeford heating oil company owner who failed to honor customers’ prepaid oil contracts.

Nicholas Curro III and his companies — Veilleux Oil, Perron Oil and Price-Rite Fuel — were ordered to pay $393,735 in restitution to 313 customers for failing to deliver oil in the winter of 2007-08. A superior court judge also ordered a civil penalty of $250,000.

In a unanimous ruling Tuesday, the Maine Supreme Judicial Court rejected Curro’s argument that the state attorney general failed to comply with a 10-day notice rule before filing a complaint against him and his companies. Justices also rejected his argument that the lower court erred in imposing a civil penalty.