student discount ???

ok I'm probably just getting a bit flustered, but I'm not getting any response i realise its a holiday in the us as well as the uk so i expect the staff are taking a very well deserved rest, but here is my problem! i want to take advantage of the student discount for the years subscription, i sent in my proof I'm a student and i got a code back but i wasn't able to get the subscription there and then as i was away from my computer, when i finally got the chance i put in the code i was given and it said it had expired, i have messaged back via the email address  that i got the code from but i haven't gotten a reply and I'm worried that if the 7 days expires will i still be able to get the discount as i applied for the code before the time was up? thoughts opinions ?