Scam Call

I received a voicemail from someone stating they were an Xfinity agent. I called the number back and they told me that my promotion was ending in 24 hours and that in order to keep my promotion, if have to pay 8 months in advance $400. I knew something was off and decided to call Xfinity directly. Turns out it was a scam. There's an escalation being setup and I have a recording of the voicemail but nowhere you send it to. The number that called me was [Edited: "Scam Phone Number"]. 

Thank you,