The teen heroes who nabbed subway arson killer Sebastian Zapeta-Calil have been denied the $10,000 reward promised by the NYPD — allegedly because they called the wrong phone number to report it, The Post has learned. The trio of eagle-eyed high school basketball players — who spotted the firebug on a Queens-bound F train hours after he allegedly burned a woman to death — were told by the reward administrators that they were ineligible for the cash because they called 911 to report their sighting instead of the Crimes Stoppers tip line.