Many of the seller are facing a problem that is about order cancellation by fiverr support team after mark the order completed saying that
"'A dispute was opened via PayPal for your order . As a result, we have to cancel this order and ask that you discontinue your work.“
If the dispute is resolved, the buyer will receive an offer to reorder your Gig.”
its really a security question for the seller.
If fiverr team do not get any step about these types of buyer its really will be hard for the workers to work in fiverr.
As fiverr only block their ids ,But if it would a huge amount of deal then It will be a great loss for the seller.
And the buyers will come again with new ids .and cheat the sellers.
PLease fiverr do something and I tell the seller to be aware about them.