Why is a deleted Zoom Phone extension accepting calls?

[BERACEDC]

A colleague has departed, and I've deleted her Zoom account and phone extension. When I call her extension through the IVR, it's still accepting voicemail recordings. The greeting says, "We are sorry there is no one available to take your call. Please leave a message after the tone..." How can a caller leave voicemail at a deleted extension? If they did leave voicemail, where would I find it?