Their customer support is horrible. I accidentally signed up for their paid service. When I saw them charging my credi card, I asked their customer support to cancel my subscription.
Two months later, I was still being billed. I ended up calling my bank and telling them to block all charges.
"It is possible that we may need to disclose Personal Information, profile information and/or information about your activities as an CallingVault user when required by subpoena or other legal process, or if CallingVault has a good faith belief that disclosure is necessary:"
-TOS