Do u remember the small size western dress scene?
To bring out the truth he tore his shirt button & made her confess the truth.
And also in car denting issue, Raman acted that he received a phone call... & that time also he succeeded.
I think Raman came home & found the card on table & thought in his mind, 'Ye madrason apne aapko kya samajti hai! Itna ego hai ki mera credit card nahi leke geya..'
So to teach a lesson he played that Prank.
Plz share ur opinion.