Blues boss Paul Sturrock felt his side should have been awarded a penalty of their own just moments before Danny Kedwell's match winning spot-kick for Gillingham on Tuesday night.
The Blues boss remains certain Michael Timlin was upended inside the area by Gills midfielder Charlie Allen.
And he could not believe referee Philip Gibbs opted to wave away his side's protests.
“It's a certain penalty and there's just no doubt about that,” Sturrock told the official website.
“The referee has said that Tims has put his head down but I don't think that's the case at all.
“He's then given Gillingham a soft penalty just a couple of minutes later and it's hard to take.
“However, we should still have taken something from the game and I didn't think we deserved to lose.”
Kedwell's penalty just before half-time proved to be the difference between the two teams, despite the Gills playing the whole of the second period with 10 men after Bradley Dack was sent off for a poor challenge on Mark Phillips.
But Blues were unable to make their extra man count and that frustrated Sturrock.
“I think our final cross or shot just wasn't good enough and we had a couple of players who were a little bit out of sorts,” he said.
“Two big decisions from the referee haven't helped either and overall it's been a disappointing evening.”