I'm still waiting. Not so patiently. I continue to contact support and continue to get personally attacks saying that I am the only person who has reported this and it is because of something I did with the blacklists and that I am responsible for fixing it myself. Yeah. Seriously.
I think the only real solution is to leave DH. Search around and you'll see that lots of their customers are finally jumping ship. You can see what hosts other former DH customers chose and how they made their decisions. Of course, what works well for one person, might not work well for you. But it's nice to see comparisons with DH so you can find one that is at least not worse.
DH has gotten worse and worse over the past 5ish years. I was stupidly expecting that they'd improve "in the near future". Dump. But I've finally had it. I draw the line at being attacked in such rude ways for something that is clearly an issue many of their customers are complaining about.