Theres not many options left to you,depends on how much time they have got for you and how impatient you can make the man with the fire and blades.

1a Lies sound a good ploy but may just stretch out the inevitable.
1b Offer to go undercover for them and have a great idea they will buy into already thought out.


#2 Probably my most honest response:
They'd be so sick of my screaming they would kill me to shut me up, win/win.

#3 Then again if it was a real sadist who they put on your ass to make it slow or criminals after cash or info and theres no hope of escape utilize inner anger; you know they are going to kill you eventually so to piss them off and be silent right to the finish may bring your end a little faster as they would eventually get pissed off with you themselves.

#3B get the torturer emotionally involved and lashing out, call him a weak cunt etc, "ha thats luxury you weak assed ponce, who fucking hired you, you little princess you hit like a little girl" etc..

Then they lose and have to dispose of you without payment and you lose too but you were going to anyway.