I have the same issue, client ordered something, i stated the results will not be to his satisfaction (A.I upscale, where he wanted the car license plates to be more clearer, i told him, it's not possible, as the quality of the video is too low, he still insisted in ordering). He was not satisfied with the result, even though he accepted my recommendation that it will not turn up out as he want to. He instantly called me out for being a scammer while he accepted the order. Now he wants a full refund. Like, hello??? You accept to buy a order that will not end up looking good, than complain it does not look good? I have contacted support, but with Easter weekend, i fear i will get no reply back soon. I'm sad this still happens on Fiverr, that someone can order from your gig, cancel it and get your work for free.