You could threaten to go to the police
You should threaten to tell the newspapers about the bad service.
You should threaten to tell the newspapers.
they threaten to kill you
to tell someone that you will kill or hurt them, or cause problems for them if they do not do what you want; to be likely to cause harm or damage to something or someonepublic figuresLaw and Crime - Ley y Delitos500 most important Spanish verbs 276 - 300