Hall's second in the final minute seemed to have won the game for the hosts but the late drama saw Steve Jones go down in the area and substitute Barry Conlon step up to convert the spot-kick.
The game also saw Bradford boss Stuart McCall sent from the dug outs and Luton striker Chris Martin sent off at the death.
Harford said: "I had a clear view of it and it was never a penalty. Our lad got a toe on the ball but he pointed to the spot and it was a total disgrace. Our league status is under threat and we've got people who are clearly incompetent taking charge of games.
"He didn't have a clue what he was doing from start to finish. He sent off Stuart McCall in the first half after he had given a free-kick for a tackle by one of their lads that wasn't even a foul. It was an awful performance from someone who shouldn't be refereeing at this level."