Comcast has agreed to pay a record $2.3 million fine to settle the FCC’s investigation into whether it improperly charged customers for services and equipment they never approved, a practice known as “zero billing option.” Federal law bans cable operators from charging customers for unauthorized equipment or services. “It is basic that a cable bill should include charges only for services and equipment ordered by the customer — nothing more and nothing less,” said Travis LeBlanc, chief of the FCC’s enforcement bureau.