So my site was down the other day and I tried to reach the support of Rackspace cloud by a tweet. You know how much time did it take them to respond?
10 minutes later, I received an email from them saying that they tried to call me but the number wasn't in service. That's because I changed my phone number recently.
3 different ways of respondence in just 10 minutes of the first complaint. Oh, did I mention the site went back online lightning fast?
I'm seriously recommending them to every of my clients from now on.