dumbass telco once again

I tried to log onto Vodafone's website to check how much recent phone activity is going to cost me. I got past the basic login, then clicked on "Billing", where it asks me to enter my SEEKRIT CUSTOMER SERVICE NUMBER (aka the last 4 digits of my account number). I got an error message, the same one as I got a few months back and which took at least a fortnight to get fixed. After 24 hours of it being broken, I figured I'd *shudder* contact the customer abuse department. I changed my password first, since I know from past experience that they'd ask for it, and I didn't want to give out the password I usually use for this sort of online thing. Then I emailed the problem description, and ended it with

Userid: [my userid]
Password: [my new password]
SEEKRIT CODE: [aforementioned account code]

Just now I got a response, quoting my original mail in its entirety, asking for my password.

GAH.