In a lengthy Facebook post, Apurva said after writing "Aligarh" he was emotionally drained and when director Hansal Mehta sent him a news article of a woman in the US who crossed the line of the law, he decided to develop it into a fun film.
"I saw 'Simran' as an opportunity to have some fun... I signed a contract with Hansal's company Karma Features, developed the idea into an original story and wrote an one- line screenplay. Hansal loved it, and took me to meet Kangana. She heard the narration and jumped at it. She told us she would do it!" he wrote.
The writer claims he was not even informed about Kangana getting the 'additional story and dialogue writer' credit initially.
"...It was after we finished the first cut of the film that Hansal called him to meet and said nervously that Kangana is turning director and therefore has demanded a co-writer credit."
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The writer said he threw a fit as he felt "shocked and betrayed" by the turn of the event and refused to give in.
"I finally gave into an additional writing credit, but only because they claimed their film would be stuck if I didn't do so. But I refused to give her a co-writer credit, and we signed a letter where they promised me the same," he added.
Apurva said he has always supported Kangana in her fight against the system but is taken aback by what she did on "Simran".
"Today, not only do I see her credit before mine on the poster ( which I had decided not to fight), but I also saw Kangana on her 'Facebook Live' event yesterday claiming that she had written the film (with Hansal) from a one-line he gave her.
The writer also slammed his frequent collaborator Hansal, with whom he has worked on critically acclaimed films like "Citylights" and "Aligarh".
"I also wish that my dear friend Hansal shows some spine and either refutes or endorses my story," Apurva concluded.
The credit drama started after release of the first poster of the movie recently.
Apurva features as the "story, screenplay and dialogue writer" in the poster but his name appears after Kangana, who is credited as 'additional story and dialogue writer'.