I have the same problem - I knew they were handing tickets back to people at the door (heard the announcement) but by the time I got there (after waiting a while!) we were told they weren’t (!), and to contact Ticketmaster, who would definitely give us refunds upon showing proof of purchase. I didn’t think for one minute he’d know this for sure, but he refused to give us tickets and asked us to leave, so that was that! He did also say that the guy on the door made a mistake and shouldn’t have taken the whole ticket at the door). I’ve since heard that some people were asking for more than one ticket back - what selfish b****rds they must be - and actually getting them!! How on earth would this work, what were the venue staff thinking?!
Anyway, I've just been on the phone to Ticketmaster, (I couldn’t see it on their FAQ section?) Was on hold for 10 mins so to save any of you doing the same thing, this is what happened! At first I was told that their policy is that they can’t issue refunds without tickets. I explained that I understood that, but this case is different – the venue took the tickets off us, and didn’t give them back. He discussed it with the others and came back to say that they’re aware of the problem as lots of people have called, and they’re thinking of the best way to solve it. He said they may have to re-issue new tickets to everyone, and make the old ones invalid. So, looks like there’s a chance it’ll be re-scheduled! Although I’d love to see him I don’t personally think it’s a good idea - he needs to rest, he really does!