Yes, image theft from Instagram is, unfortunately, very common. You can notify Instagram directly through their form or fight for copyright infringement via legal channels. Instagram will remove the images but won’t help you get paid or recognized and won’t delete the account that stole them.
If you go through the legal way, you still might not have a satisfactory result – look at the Richard Prince case where he exhibited and sold portraits found on Instagram without permission and was found as fair use.