It's very easy to avoid being spear phished: do not trust any unsolicited message over any medium. Email/text/phone message/popup window purporting to be from your registrar with an urgent call to action? Ignore said call and contact them directly via known good number, email address, URL, etc.
EDIT: Voice mimicry scam? Verify via known channel before taking action.
EDIT: Voice mimicry scam? Verify via known channel before taking action.