I also came across people who would report bugs that don't exist. The team would spend days trying to track down the problem user is reporting, but the problem was never there. One case I remember user would claim that he paid for an item, but it is not visible on his account and he would keep asking for a refund, but when checked the items looked as they should. We asked him to send some screenshots and apparently he had photoshopped the items out from the screens. He stopped asking when we told him that our support member would like to access his desktop remotely to fix the problem.