Why the new(Jassi is a fraud)twist?
My guess is really because to boost TV ratings. I suppose Tony & Deeya Singh realize that after a streak of mediocre TV ratings. The continous head-beating it's audience of puppy-love theme is getting outplayed(or overplayed).
The twist itself
Either Tony & Deeya Singh are really stupid. Or they think that of there viewers. To me, it seems more focus is given to it's claims(that Jassi stole money) and no attention what so ever at the evidence(The Banks! Jassi never created this "J" bank account. Just because the letter "J" applies to the initial of her first name, is quite frail of proof and meaningless to convict Jassi for anything.) A deeper look at where the money is can easily reslove everything, but the show is overdoing it by looking beyond this factor for the high tone intesity(hence, the TV ratings).