will not come out of park and the switch underneath seems to be jammed

The shifter on my truck has been sticky since I bought it, but finally the other day I went to shift it into drive and the whole shifter fell. I was able to put it into drive by using the switch underneath and got it home. I replaced the whole shifter cable, and can move it now. But it will not come out of park and the switch underneath seems to be jammed.