I had this problem. I used their online tool to see if I could move my service to the new place, and it said the location wasn't covered. I still had to call them and cancel by phone. I had to wait for them to determine whether or not the location was covered in that location even though I told them their automated system had already confirmed that it was not. I had to sit through their goddamn scripted bullshit until my account was finally canceled.

Edit: just so many typos + clarification lol. I must have written this while half asleep.