Ignore the $19.
I just got into my Citibank internet banking, and let me quote
* A fee of $10 is applicable for an Additional Silver Card, $30 for an Additional Gold Card and $90 for an Additional Platinum Card. Additional Clear Cards are free
So you just wait for it to be listed on your monthly statement, then call them and abuse them, they will give you a refund.
I called them and told them about this misprint in January to get my refund, and it's now August, still there.
That's how hopeless Citibank is