HI, it happened to me to.
After i completed work, buyer kept asking for strange revisions and kept changing them.
Then next my access to website was removed, and then next day Fiverr support cancelled order.
Never got chance to remove my code and website is live now with my entire child theme and pages, post completed in it.
Here you can see my name in child theme file. https://rollrasen-max.de/wp-content/themes/flatsome-child/style.css
This is just one file, full child theme has many codes and files.
Really, we can work but we can foget about getting paid, even fiverr support doesn't check anything at all.