I believe you can order them online as well. I remember seeing a web site where you could order a replacement I/O plate free of charge. Just dig around their website. I'm sure you can find it. It was a while ago, so i'm not sure if its still there. I'll search for it though...
And from my experience, antec has been great. I got a 1030 from onvia with a broken bezel, and instead of hasseling with onvia, the people at antec just sent me a brand new bezel free of charge. Give them a break, its the holidays, may take them some time to respond.