
One other thing is to talk with them and ask them a higer price because of their revisions. The last thing is to leave that bullshit platform because of that. It's your choice how your are dealing with this kind of issues.
I left Fiverr because of a stupid Fiverr client, and because Fiverr took his side later. Life is hard when you are dealinf with people in general and harder when you are dealing online with people in special, and having your own domain for promoting and selling your services is the best thing.