Lego sent the wrong piece with this set

So I’m currently building my second gunship. I was on the last part making the last wing. When I was done I realized that I made the same wing that goes on the other side so I thought I built it inverted and needed to redo the build. However I noticed that in the bag the three triangle piece they gave me are actually meant to go on the side i already did. In other words they sent me parts to build the same wing on the same side. Do I just call customer service to get replacement pieces. I referenced off my first gunship to make sure I didn’t do anything wrong but when I lined up the pieces it immediately looks like they sent the wrong ones