Bangkok Bank Visa Debit Card

I just tried to pay for a Nok Air flight online using my bangkok bank visa card.

All was going well and the site ask me to obtain a verification code from a number i had to dial.

I followed the instructions given and called up the number.

Acquire the Reference Code via Bualuang phone

1) Dial Bualuang phone 1333 or 66-2645-5555

2) Press 7 for choosing Verified by Visa

3) Press 1 to create reference code for register Verified by Visa

4) Enter your Be 1st card number

5) Enter your Be 1st Personal Identification Number (PIN)

6) Create your own reference code (8 digits)

7) Confirm your reference code

All went well (although VERY quiet. I had to strain to hear what was being said) until the last part where the automated voice asks me to "enter your own eight digit reference code followed by the ? key". I have NO idea what she says there! It sounds like she says followed by the "pound" key. But that makes no sense to me. I tried both the # key and the * key and i am met with "we do not recognise any number keyed" ..or something along those lines.

Has anyone used this service, and if so, can you please tell me what the heck she is saying?

Thank you!