if my order marked as complete. then buyer can demand any revision after that?
no you can not provide him or her revisions.
This depends and I just encountered this a couple weeks ago.
If the buyer marks the order complete manually, you really aren’t obligated to provide any additional revisions. However, if the order marks complete automatically and the buyer comes back after to request revisions, it’s something that should be addressed. I only found that one out after a client of mine got in touch with Fiverr CS and they said that it should be accommodated.
But there are a lot of factors to take into account: how extensive the revisions are, how long after the fact the client has gotten in touch for revisions, etc.
As a courtesy, I usually honor those modification requests because I’m always there for my client.
However, if the requested revision exceeds my revision policy, I would politely request for them to purchase my gig for this update.
Remember, they can still leave a review based off the experience they will receive from you. If it’s exceptional, that’ll hopefully reflect in the review they will leave you.