Help! An Instagram User is Impersonating Me Online

I'm using instagram for at least one year now and I've never had a problem with it but for a really short time my page was public and now I've found out that I have fake pages. Most people deal with blocked pages but this is different. One of them was reported and he/she deleted my pictures but now there's another one which is really disturbing because this person is using my name and my pictures.