From HSBC VBV
Q: How do I register my HSBC Bank Visa card for the service?
A: You can register via our Personal Internet Banking service by clicking on your Visa card details and then the 'Verified by Visa' heading on the left-hand navigation bar. You'll be given your Activation Code, which you'll use to log onto the Verified by Visa website at https://secure6.arcot.com/vpas/hsbc
. Input your card details along with your Activation Code, set your Personal Assurance Message (see below) and password, and you're ready to go
Alternatively, call us on 0845 606 3535 from 8am to 10pm every day (except Christmas Day, Boxing Day and New Year's Day), to be given a Temporary Password which allows you to register for the service. Then all you need to do is logon to the Verified by Visa website at https://secure6.arcot.com/vpas/hsbc
and click on 'Assisted Registration'. Then input your card details along with the Temporary Password, set your Personal Assurance Message (see below) and password, and you're ready to go. If you have more than one HSBC Bank Visa card you must register each one individually.
Have you tried that phone number?