To avoid misunderstandings or buyers taking advantage of that loophole, you should specify that you don’t do revisions after the order is completed. Also, any time a buyer holds you ransom and threatens you with a bad review if you don’t do something, if you are in the right, contact CS. I reported a buyer for similar behavior and CS automatically completed the order for me and I was able to cut off all communication with the buyer and he left me alone.