Block the number immediately if you suspect a tax‑related scam. Recognize that callers often use a familiar name like John to create false trust, then pressure you into sharing personal data or making payments. Let the call go to voicemail whenever possible, and never click links or reply to text prompts. Report the incident to the FTC or your phone carrier’s spam‑blocking service, and consider adding the number to a reputable blacklist app. Keep a log of the call details in case you need to dispute fraudulent charges later. Stay skeptical and protect your financial information.