I am dealing with such in different clients, fuck them, fuck these people. Even worse, you are taken hostage to their sales team,what can you do? Break the cont

I am dealing with such in different clients, fuck them, fuck these people. Even worse, you are taken hostage to their sales team,what can you do? Break the contract? Penalties when you barely have a working solution? Bring the legal team? Yeah sure, good luck to have anything completed.