I've had some sales, too.
I got an email from DTP today telling me my payment is held up because I didn't enter the required tax payer information. I did enter it, of course, and what's even stranger is that I'm paid up to date. I have no idea why they emailed me.
It looks like DTP is a work in progress. I'm grateful they exist, but I do wish they'd beef up their staffing and support. I also wish that when they respond to an email, it wouldn't be from an address that can't receive email. If they don't resolve the issue, you have to start over -- an inefficient process that could be streamlined by having the conversation about the issue continue from one email to another.