Your banking data (accounts and cards) are strictly confidential: they belong to you and must not be communicated to a third party, even a trusted one.
Check the identity of the person you are speaking to before passing on any information or carrying out any action requested of you*. If in doubt, hang up and contact your advisor through your usual channels.
* Be careful: the telephone number displayed may seem legitimate or known to you from your contact list (bank branch, customer service...), but in some cases it may have been spoofed by the fraudster using the "spoofing" technique. The fraudster can personalize the number displayed: this is called spoofing. Also check the e-mail addresses of the people who contact you.