The story was quite interesting and was going really well. but the climax was a disappointment as it definitely could've been made much better, instead of leaving it open.
One possible type of climax which I could think of goes like this --(Spoiler Alert):-
In the end, Sattu himself becomes a lawyer by passing his pending law exams with decent marks, then represents his wife as a lawyer, and fights her case to get her justice. And later they also have a baby to show that they both finally touched "4th base" with each other and in this way, Katha finally healed and moved on in her life.....or something like that, which wouldn't leave any open-ended questions in the audience's mind.