Hmm, seems like poor communication on their part. There is no point in giving a downtime window of time if you are not going to keep to it without updating clients first. Most likely they are very busy fixing the server issues and I would understand the need to stay focused on that but then you forget about the customer who is waiting for answers.
Hopefully you can get in contact with someone, maybe give them a call and see if they can give you an update on when you can expect your site back up. Good Luck!
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a-int - i would review their legal documents such as their SLA (if they have one) and see what sort of discounts they offer if they don't meet their monthly 99.9% uptime. Alot of providers will offer a 10% discount that month or the upcoming month and then progress higher on the discount determining how far off they were from meeting their uptime guarantee.
Of course - if this downtime is from schedule maintenance - well - then the SLA really won't apply. Uptime guarantee for a lot of companies is from unexpected downtime not from schedule maintenance.