Kantor on 11 August 2012
Well, it is the weekend. Usually they respond within 24 hours, so that might be a little longer here but you will have a response soon.
The important thing is that they actually HELP you, rather than going through a checklist like EA does whereby you run all sorts of virus scans and diagnostics that have nothing to do with your problem. Also, they speak English. Valve customer support is among the best I have seen, and I'm sure they will let you have the deal if it has expired by then.
(Former) Lead Moderator and (Eternal) VGC Detective 
