Just got a call, didn't pick up and they did not leave a voicemail. When I called the number back, I got an automated system saying they were "WCA Subscriber Services" - you can press 5 to get to cancellation (where they make you listen to a long list of the reasons why not to cancel), then press 2 to cancel (it takes7 days to process cancellation request).
Before you cancel, they have an automated message explaining all the benefits of not cancelling. Supposedly you're entered into a daily cash giveaway every time you pick up your phone. I cancelled anyway.