Why contracts cant be revoked ?

First and formost Asim for being Shukla's punching bag

Shehnaaz injuring Rashmi with a towel

Shefali Zariwala and Mahira for pushing each other

Madhurima and bagga for throwing water and then getting physical

Rashmi trying to kick Bag ga

Vishal and Bhau pushing each other

Shehnaz chest butting Dey

Himanshi pushing Shehnaz

Shehnaz pushing Asim during fights

Sid and Paras catching Shehnaaz around the neck

Unfortunately today even Shukla got coffee or tea thrown on him

So the trio of Shukla, Rashmi and Ramlal for throwing edible liquid on each other

Shukla tearing Arhaans shirt

Contracts kyon nahi revoke karthe hain ? Unless there is a clause that contestants are free to hot each other.