Help!!!

I was putting speakers in my BRAND NEW Mazda 2 with a friend last night, and now my passenger door is stuck locked. I believe the rod that connects the lock to the lock on the interior handle is disconnected now. The door panel can't be taken off without opening the door which can't be done. There also is no physical key unlock on the outside of the door, and there is not a big enough gap when I roll the window down to try and look down inside.

Only way I see fixing it now is cutting a hole in the door panel which I don't want to do because I have only had the car for a week. I am pretty sure we did open the door after it was put back together though, so it must not have happened right away. Any ideas?