Rovers dominated the match for long spells at Hillsborough, but went down 2-1 thanks to two first half goals from Vincent Sasso.
Trailing at the break Rovers had the better of the second half and thought they had drawn level when Marvin Emnes fired in off the crossbar, but the officials incorrectly ruled that it hadn't crossed the line.
It then got worse for Rovers as Hope Akpan fired home only to see his goal chalked off, to compound matters the midfielder saw red for pushing the referee in frustration.
"I would suggest that we have been robbed of three points tonight," said Coyle after the game.
"The performance was certainly worthy of three points, the officials have made terrible errors that have cost us tonight.
"We started well but we have to defend the free-kick better, Sam got pinned at the back post and the lad has had an unbelievable finish.
"But we score from our own set-play to get back in it and then find ourselves 2-1 down when the lad gets off his marker with the header.
"But from that point on we've dominated the game. They had one or two counter-attacks because they have good players. But to come here and give that performance, for me it merited three points.
"We've actually scored three good goals tonight. Marven Emnes scores a great goal that is clearly over the line but they don't give it. And then Loovens has headed the ball against Hope Akpan's chest and shoulder, but certainly not his hand, as he puts it in.
"The fans that were here tonight will have seen the effort that the lads put into the game. It is robbery, no doubt about it. It is beyond belief what has happened to us tonight."
Rovers are back in action this Sunday when they take on Manchester United in the fifth round of the Emirates FA Cup.
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