There are some people who were waiting more than a week for the answer. But eventually they come back.
The solution for your problem is choosing more recent exchange where they don't have problem with too many clients
More recent exchanges? I wouldn't recommend this. Bitstamp is a trusted site and even though sometimes it may take them a while to reply to a support message, they will reply and do their best to sort out the issue. Anyway, all the exchanges that are considered trustworthy will be in the same boat considering the amount of people buying in and out of Bitcoin right now. Most of the support messages will probably be concerning fees.