Here’s what consumers have asked with answers from Fiverr staff and previous consumers.
Whenever you try to "cheat" a system I can guarantee people will use shady methods to fulfill the request. I'm a web designer/programmer and Google is constantly looking for people who game the system to penalize them so honest websites float to the top over the cheaters and gamers. So ask yourself why you are taking the chance of getting penalized and sent to the bottom of the search engines? How would someone post your links in a legitimate way? In the meantime, since you seem to be determined to do it, they should submit a list of where they posted, and you "spot check" random entries to verify.
The best thing to do is try for a mutual cancellation with the seller. (or if you are the seller try to get the buyer to mutually cancel with you.) I have found at leats from my end, as a seller, that most buyers are pigheaded selfish and frankly stupid. When trying to cancel for whatever reason they say "no i paid I want the artwork i paid you gimme gimme gimme" and even though I am trying to cancel, thus giving them a full refund, and i explain that for instance I am not capable of doing their project for whatever reason... (real life situation or hardware problems etc) they wont cancel, because, well quite frankly, they are idiots, who just want free labor. From the alternative point of view sometimes a seller, in few, but still occurring cases will refuse to cancel because they wish to be paid for the time they have already put in. Customner service ius frankly useless in these cases so they best course of action is to try and agree on a fractional cancellation. EX the buyer pays for the labor, and all current work and results of the gig, but not full price because they were not satisfied and feel they did not get their moneys worth. I have found that even though buyers are often very dumb (for lack of a better word) they will get the point if you just keep respectfully guiding them to a suitable compromise.
If you have solid and obvious proof that it's much much below expectation, you can dispute in the order or create ticket for Fiverr support to dispute this. Usually, if it's not totally out of what is described in the gig package, I will give chance to seller to revise the work, with clear specification of what I wish to be revised and maybe give example, not just a comment "Not what I wanted". Good luck in getting what you want. :)