It's been happening on and off to me for weeks now. It caused me to miss out on an item on easy pay a while ago and I was fuming - I decided to order it on the website as I was already there anyway and thought it would be the quickest way. However, I got the same message as you every time I tried. I could hear on the telly that the item was selling very very quickly so decided to give up and do it via QCut but by the time I'd got to my phone, dialled, etc. etc. it was too late - just as I'd got connected I heard the presenter say it had sold out - to say I was pissed off would be a huge understatement :headbang::headbang::headbang::headbang:
I think I posted a thread about it at the time too.