I already gave you the reason, Saanjh is too unimportant to be called a vamp, you need to be important to the storyline to become a vamp, and I don't think removing Saanjh from Beyhadh would make any difference to the story, so I can call her a bad character but not a vamp, she is at max the side vamp, the only thing being she isn't the fan of the main vamp
I don't like verbal abuse so wouldn't call Vandana the word you said, but yes she is a possessive grey character too, but do you really think she is the vamp? Don't show her for a month n there will be no halt to the story
About how obessesion makes Maya villian, well there are umpteen movies where the husband is obbsessive and is therefore the villian, making your partner suffocate in a relation is among the worst kinds of domestic violence,
By the way Maya has also committed criminal act i.e. suicide attempts
So yes Maya is the villian
Any typical story is 50% of the hero, 30% of the villian, 10% of the second lead n 10% of all the remaining characters
Here the story is 80% about Maya (both hero n villian share) 10% is of Arjun n 10% of Saanjh n Arjun's family
Anyhow I have put up my point, you are free to disagree and I am free to have my opinion