Why I believe it's anurag is because since the party anurag was trying to provoke and instigate bajaj. He kept repeating do you want to kill me in the hopes that bajaj will say back what he said in front of a crowd of people. Then he told anupham how he believed bajaj was the one to frame veena and injure himself. Notice how anurag is copying everything bajaj is doing. This is where he gets his idea. Also that scene in the beginning with anurag trying to bribe the employee makes me believe he actually did and it's a setup. Right now the aunt is worrying over her image being tarnished with what she did with veena. She is trying to stay in bajaj good books. What does framing bajaj get her? She wants his money and power and taanvi is not married to bajaj yet.
You know it seems like it has to be Anurag, but I doubt they will degrade Anu's character to that level .( unless EK is pissed off to that level😆) Afterall they need to keep this character as an important part of Prerna's life till the end. Like in the terrace scene today it seemed like a bad move in precap but in episode they showed like he is doing a good thing for P. My theory says it is the Aunt who wants P to believe that RB wants to kill Anu so that there is misunderstanding between the two, which will backfire as usual.😆