It is really hard to understand what might be wrong from your description. But, if it is a bad switch that needs to be replaced, there is a good bit of labor involved in getting down to it. You have to pull the steering wheel and go down through the column to get to it. You have to be careful 'cuz of the airbag, radio controls, and the little vats wires, but some parts houses will loan the puller, and if you have a Chilton'* 28200 and a day to spend with it, you can get it done. This is a great candidate for a junkyard part. They are not cheap new. Because it is so much work, if you cannot figure out what is wrong, it may be worth taking it to a mechanic just to get a diagnosis and an estimate. Most will do this for a little $ or for free. You don't want to tear it apart if you don't really need to. I would not be surprised if a shop would charge $200 or more to change out the switch.
Can you post some pictures to give us a better idea what is wrong?