Why wont my DTAs work after attempting to activate online and over the phone?

I've tried activating my DTAs several times, via the online interface, talking to an online rep, and over the phone. Yet, I still cant get the devices work. The box's light is still blinking and the screen displays a message that says, " We're sorry, we've detected an interruption in your service." I can guarantee the problem is not on my end, as I am very technologically inclined. Surely I can do something as simple as connect the box to the TV.

But every time I talk to a representative, they give me the same story. They tell me they've "sent an activation signal to my device," ask me to wait for a few minutes, and when I tell them nothing has changed, they say it can take up to an hour and then hang up. Alas, hours and several tries later, my DTA's are still not functioning properly and I have been without TV for a month. I'd rather not pay a service technician to come to my home to fix a problem that I am not responsible for.