Level 1

I have a invoice that will not go away it’s for $900 and keeps reappearing and sending to a customer on it’s on I’ve tried deleting it marking paid and it reappears?

Level 3

Reports and accounting

It might be set up as a recurring transaction.  Go to SETTINGS > LISTS > RECURRING TRANSACTIONS and see if it's listed there.  You can edit or delete it if it's there.