Thanks Wil. My problem was (yes, it's finally solved now) actually of the account type (adding, moving and disabling services and domains, etc.)
Thanks to Jeff (glad that you're always here) and Julian and Brian, all my 100+ domains were brought to life again in less than 24 hours. This saved me from being brutally bombarded by my clients.
I'm glad that DH is still my favourite host after all, but I guess there's some room for improvement especially in Customer Service. I'm not saying that the Support staff are not up to the standard; on the contrary, they are extremely helpful. But as I mentioned earlier in this thread, when YOUR websites are down (or in other critical situations), 3 hours with no response is already a nightmare, not to say 6 or 12. I know that phone support is very expensive; but with 28,951 domains hosting, I guess it's time to start considering that option.