You are checking the wrong site I believe, I had that same issue and thought they may have been pulling a fast one. Then I realized I was using the same link you were using and that is not the right link.
Try this one:
I received both my $10 and $70 rebates in that order.
Thanks for the link. I haven't checked out this thread since sending in the rebate, but it looks like my status is "Approved" and the comments state, "Ship Date:08/07/2013."
That's great news for me. I purchased this drive as a backup and am glad I did - last week, my main external hard drive cleared itself completely without a single warning. I lost most of my media files, but all my essential files are saved in the cloud, fortunately.