How do you react when someone else adds your project?

Not my first time producing, but first time working with a team of professionals to create a film for a festival whose deadline is coming up. I didn't want to add it to IMDb until I was sure that we were going to turn it in, but came online yesterday to find out someone had added my film with minimal credits, and had some of them wrong. And worse, since I figured I had no choice but to build off this new existing profile, the new cast credits went through, with emails confirming the submissions, but the very important crew updates didn't result in an email telling me that they'd been submitted (although they must have been, because a second attempt was rejected as a duplicate). My instinct was to ask support to delete it, since I don't know who did it - anyone who is on the project knows who the proper department heads are. I was really excited about entering it myself, and feel very deflated about the situation. What would you have done?

(I don't want to chew anyone out about it, since it might be someone who still has work to do on it...)