If you want to request a permanent deletion of your Instagram account, log on to the Instagram website from a web browser or mobile phone.
Logging into your Instagram account from a web browser. Go to the “Deletion Page.” Select a reason for deleting and re-enter password. Click ‘Permanently delete my account.’
Open your Instagram app on your iPhone or Android. …Tap the three lines in the top-right corner. …Select Remove from all account that appears next to this account at the bottom, and tap Delete Account.
The fact is, Instagram deletes users accounts with 3-4 reports from various accounts. A large number of complaints only speeds up the review process and has no other effect.