Instagram's stance on Impersonation
Instagram takes safety seriously. If someone created an Instagram account pretending to be you, you can report it to them. Make sure to provide all the requested information, including a photo of your ID.
Instagram will only respond to reports sent to them from the person who's being impersonated or a representative of the person who's being impersonated (e.g. a parent). If someone you know is being impersonated, please encourage that person to report it.
If you have an account, click here to report impersonation
If you don't have an account click here to report impersonation