You can contact Instagram support by email at support@instagram.com or by phone at (650) 543-4800. However, it's unlikely you'll receive a response through these channels. 
You can also report a technical issue on Instagram through the app's settings:
  1. Tap Help under More info and support in the top right
  2. Tap Report a Problem
  3. Choose to shake your phone to report the issue, or tap Report problem without shaking 
To contact Meta Verified support for a verified creator account, you can:
  1. Log in to your verified account in the Instagram app
  2. Tap your profile picture in the bottom right to go to your profile
  3. Tap in the top right, then tap Meta Verified
  4. Tap your verified profile, then tap Get support
  5. Select the issue you need support for