If you believe that content posted on Instagram is infringing your copyright, you can take the following actions:
Report it by filling out this form.
Send a complaint using the Brand Protection tool, which allows rights holders to identify counterfeit goods and content that infringe copyright and trademark rights.
Contact Instagram's designated notification and counter-notification procedures under the US Digital Millenium Copyright Act (DMCA). In this case, be sure to attach a full description of the copyright infringement claim to your complaint.
Notes:
Only the copyright owner or his official representative may complain about copyright infringement.
If you believe that material on Instagram infringes the copyright of a third party, you may report it to the owner.
Instagram will provide the name of the copyright holder, your email address as well as the content of the complaint to the person who posted the content.
If you are submitting a complaint as an authorized representative of the rights holder, Instagram provides the name of the client or the name of the organization on whose behalf you are acting. It is therefore recommended to provide a valid company email address or your own working email address.