Asrani has alleged that the film's lead actress, Kangana Ranaut, who has been credited as 'additional dialogue and story writer' tried to discredit his work in public by saying that she developed the story with Mehta from a one-line script.
Mehta, however, without taking any names said that he will continue to credit people who work to improve his films.
"Yes I am guilty. Guilty of crediting individuals who contribute to making my films very special to many of us," Mehta tweeted.
Alluding to Asrani's comment that Mehta should show some spine and clear the air over the controversy, the director wrote, "My spine is whatever it is, weak or strong, it is only for my film and nothing else. If I chose not to speak it is for my film.
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"And when I do speak it will only be in the service of my film-not driven by any blackmail or any noise on social media where dignity is perceived as weakness and conversation is replaced by allegation."
The director also took pot-shots at those who had criticised him for staying silent on the issue.
Asrani responded on Twitter saying, "If only he mentioned 'the truth' as many times as he has mentioned 'MY film', he wouldn't have found himself in this degrading situation."
The credit row took an ugly turn with Asrani saying he was arm-twisted into giving in Kangana's demand, an allegation denied by the film's producer Shailesh Singh who said Asrani was creating a ruckus for publicity.
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