(I think a few people who can probably help you better than I can are all asleep)
If you have time to browse or search the forums, I think you’ll find a few cases where customers have had severe difficulties getting their accounts active. When I’ve read these, I often get the impression (though it’s hard to tell) that the customer has slipped up but assumes DH is at fault and doesn’t check their own input.
So I would go to the panel and check all the details very thoroughly.
Also give more detailed information here so it’s ready when someone knowledgeable arrives to help you. For instance, what, if anything, has been processes, and what hasn’t? Does the panel say the account is pending approval? Does it show your domain(s)? etc
Could be that there’s actually no problem. Credit card payments are (usually) instant, but with a money order you can have postal and other delays. If your payment hasn’t been processed, a support person in too much hurry might look up the details, see that setup isn’t complete, and misinterpret the cause.