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Continues the source, "Vidya actually walked out not once but twice. After hearing the lurid content and the way she said those words on screen, Vidya simply sighed and said she couldn't say those lines again. The panicky dubbing-in-charge cajoled her back. But again Vidya left."

Director Abhishek had to step in to convince Vidya to just forget her own aesthetic sensibilities and speak the language of her saucy character. But then if it is Vishal Bhardwaj's production it's got to be abusive. Kaminey legitimized the term kaminey. In Ishqiya we've the suave and sober Vidya Balan using the word 'ch***iya' without flinching.

Says Vidya, "It wasn't easy for me. I couldn't say the word out loud. During rehearsals I'd just mumble it under my breath or not say it at all. My co-star Arshad Warsi said I'd have to say it out loud in the rehearsals, or it wouldn't come out right in the final take. But I insisted on just skipping the word in the rehearsals. But when I said it out aloud in front of the camera it sounded like I had been saying it all my life. Fortunately Ishqiya had sync sound, so I thought I wouldn't have to say those expletives again."

Source : http://entertainment.oneindia.in/bollywood/features/2010/vidya-dub-ishqiya-290110.html

Could you please explain to me thee emboldened parts?

Though I can guess " got to be abusive" means "will be abusive(rude and offensive words)".
Comments  
"It's got to be abusive" means 'it has to be abusive', 'it's bound to be abusive', 'there's just no way that it isn't abusive'.
Thank you friend.

Similarly, could you please explain to me "then if it is" as well?
Students: Are you brave enough to let our tutors analyse your pronunciation?
User_garyBut then if it is Vishal Bhardwaj's production
it means the following:

But then if this film is directed by Vishal Bhardwaj.....
But then if the director of this film is Vishal Bhardwaj.....
User_garyBut then if it is Vishal Bhardwaj's production it's got to be abusive.
The whole sentence means that "since the director of the film is Vishal Bhardwaj then it must be abusive". (Possibly because he made abusive films earlier)

Hope you see what it means now.
Michal
Thanks a lot Micahel S
I got the sentence meaning but I think I'm still bemused with the usage of the expression "but then" here.
Take a look at that. It's taken from Longman Dictionary of Contemporary English:

but then (again)
a) used when you are adding a statement that says almost the opposite of what you have just said:
John might be ready to help us, but then again, he might not.
You feel really sorry for him. But then again, it's hard to like him.

b) used when you are adding a statement that makes what you have just said seem less surprising:
Dinah missed the last rehearsal, but then she always was unreliable, wasn't she?

I have no time now to read the context carefully and tell you exactly why there is "but then". If you don't come up with an idea yourself I'll get back to you tomorrow.

cheers,
Michal
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