Open with
Hi, I'm returning a call from this number.
Then say
- I had a missed call an hour ago.
- May I ask who I'm speaking to?
- Could you tell me what it's about?
If they ask
- I need to verify your identity.
- Tell me who you are first and I'll call the official number back.
- It's about your account.
- I'll call the official number and ask there.
- Give me your ID number.
- I don't give that out by phone. I'm going to hang up now.
Ending
Thanks. I'll check and get back to you.