@Edent most banks are absolutely terrible at wording their SMS confirmation messages.
I've had genuine incoming "give us your details first to pass security" calls recently and it's frustrating. They follow it up with a generic code via SMS, which is the same one they use if you call them so the whole process is totally vulnerable to a MITM attack.
If I didn't have a need to make timely progress with something I'd start taking their "NEVER SHARE YOUR VERIFICATION CODE" message literally.