Why didn't Sai expose pakhi

Why didn't Sai tell virat that his so called perfect wife patralekha called her there to tell her to take Savi and go away?

I mean that's a very important piece of information

Patralekha kept on telling virat in the bedroom that she didn't do anything wrong blah blah blah

So surely this piece of information is very important, and even more important for virat to know that his BIWI is a liar and she was trying to send his daughter away!!!!