Only did it on 1 account but FYI:
My issue was cancelling because I had scheduled to cancel on a Mon holiday without realizing. I called in (only way to cancel) and got a recording saying they were only open M-F until 5(?) EST and closed holidays. I ended up canceling the day they would have actually charged me (day 8) but everything was ok. So in summary: must call to cancel, open M-F, closed holidays, hours limited to EST working hours. (As a Californian who attempted to cancel on Columbus Day this offer very much stuck in my head!)