Easiest way to work on this, is to remove the throttle body(just need a new gasket.....
As Kat asked, did you remove the broken bolt? You will have to remove the housing again, and if enough of that bolt is sticking out of the lower intake, should be able to grab it.....
What do you mean wrong bolt? Too long? Too short? Did you damage the lower intake threads? No need to overtorque a rubber seal.....