Cannot seem to delete voice mailbox - phone is still lit up red

[ubergeek1]

I have CUCM and Unity both are 8.6 and I moved an extension and deleted the vm mailbox and vm on this extension.  The problem is the phone handset is still red even after unplugging it and reregistering the phone.  How can I fix this?  We dont need a voice mailbox on this extension.  Any help would be great.  Thanks