You left a pretty big opening, you didn't specify what's with us. I could say I'd get my cell phone from my pocket and call 911. I'd think someone that would do this would take it though, or at least break it or take the battery or put me somewhere with no reception.
After this is what I would do, in order, assuming there's been no response to the previous steps and my cell phone is gone or can't make calls (or receive them, since if I went missing, people would try to call me).
ask what's going on and where I am
try to get my cell phone
find it isn't there or doesn't work
ask what's going on again and why I'm here
somewhere around here I'd notice my surroundings including the buttons
call for help (that is, yell for help) for a few minutes
think about my situation-- I'd be doing that the whole time but more so starting at this point
ask that whoever did this doesn't hurt me, or my family, or my friends, or hopefully anyone at all-- ask, but not beg
ask which button to press
they could want anything, they could want me to ask which button to press, or ask they don't hurt me, or call for help, or be defiant, or even say that I won't give them whatever satisfaction they might be looking for; any of it could be what they want, so instead of saying I won't give them their satisfaction, I'd say I don't want to give them their satisfaction, don't intend to, and will try not to
yell and scream for help every few hours or every hour or as often as I think is reasonable, and try to get out of the chair, since I don't know how feasible it is
if I have my phone and it works aside from calling people I'd play Reversi every now and then-- sudoku is more stress than I'd need in this situation
wait until I feel-- or know, from some outside source or the watch I think I'm getting for Christmas or my working-but-unable-to-make-or-receive-calls cell phone-- that two days and a few hours have passed-- it takes roughly three days to die of dehydration
ask to be let go, or to get some information (where am I, who are you, what's the deal with the buttons, etc.), or at least some water, and ask that I don't get hurt and no one else does either
wait a little while
yell for help
maybe try to jerk it, it would depend on a few things
think back on my life wistfully
yell for help again
if I have my phone and it works aside from calling people I'd try to record some semblance of a last will and testament-- I don't think it would be legally binding but it might help my family, if I die and they get ahold of it
yell for help one more time
check for my wallet; assuming I still have it with me, get it out, assign one button to heads and one to tails, and flip a coin-- I might do it multiple times, especially if I find myself not liking the outcome I get
if I don't have my wallet I might try to emulate a coin flip with my phone or my glasses or whatever I can move
if I can't flip or toss anything... eenie meenie minie moe
...then I'd press whichever button got selected, and then it would be the mystery person's move. I'd find out what happens. What would horrify me the most is if nothing happened. If nothing seemed to happen within, IDK, half an hour, I'd try to press the other button and/or open the cover(s) on the button(s). If that didn't get me anywhere I'd ask one more time what was going on and why, and then continue yelling for help every once in a while until I pass out.
From there, there would effectively be three possibilities, which would obviously be out of my hands, although one or more of my previous choices might influence or even decide which one happens.
1. I die
2. someone helps me
3. someone keeps me alive and restrained, or otherwise under their control
With the first two it's over one way or another. If the last one happens it's pretty much become a "regular" kidnapping situation and I'd try to do what I can to get away, within reason, while trying to keep to the principles I live by.
