First if they did not inform you intentionally in interview than it is unethical . but now if you are part of firm , it depends upon location if it is convenient to you than what is the problem . or if having any problem talk with your superior and tell them .as you didn't inform me about location i am not ready to move because of some personal or any reason.
It may be possible they have already presume that you may be ready to relocate .Any company will not select candidate who is not fit for them there might be some specific reason.because all process of recruitment is not free of cost .
And at the last my personal opinion -- Any thing is not free in the world . Sacrifices always come between.
Go and initiate talk.
27th July 2016 From India, Jalalpur