You can leave someone a trust feedback even though you haven't deal with them in the past. And also, maybe Vod spotted something suspicious in your sales that's why he left you with such a feedback. He doesn't simply do that to users, he probably got his reasons before taking those actions. Might as well settle this with Vod and convince him to remove the negative feedback, but I don't think he would do it unless you've proven yourself as a legit seller and a trustworthy member of this forum.