Instagram how to report increased success rate

One person registered a lot of accounts to publish the same thing
He kept follow me with all account and liked my post. I want to know how I report his account.
I previously reported spam, but just a few account stoped
how to report increased success rate

Then try to report all accounts as spam again. Or ask your colleagues to report the accounts, so you can have a stronger report regarding the accounts' activity. -Micah