this looks bad to me. no contact no email and david have not replied. and no money. not ok.
Have you checked the spam folder, and if it's the right e-mail you were using?
Since, each time you withdraw to a different address they contact you to make sure it was you who made the withdrawal.
Are you sure about that? That they contact you when you withdraw to a new address? I've done withdrawls to several different addresses without any issue and I've never had to confirm through email or something. Maybe I'm trusted enough, not sure haha.