I have similar problem. I have contacted sonic.net to place my DirectTV order. The order was declined by DirectTV. I have excellent credit, so it should not be a problem. Sonic.net representative asked me to call DirectTV which I did. The DirectTV indicated nothing wrong me and suggested me to sign up directly. He took all the info, ran credit check and said there's nothing wrong and he can placed the order then.
I called Sonic.net back to see if I would still get a bundle if I sign up through direct tv and the answer is no. I asked Sonic.net to place the order one more time and it's declined again. I am just wondering if anyone has this problem before, that's unable to place direct tv order via sonic.net, but able to do so directly.
PS: I used to be an Direct TV customer a while back, but it's already more than 2 years ago. Not sure if this is the issue, but ordering directly to Direct TV seems fine though