I think the CSR you spoke with was misinformed, as this board has shown to be a frequent occurrence.
The Terms & Conditions are quite clear. If you go to this link:
www.ba.com/redeemfor1travelfor2
...you will find the following statement: "
New British Airways Visa Card reward begins January 1, 2010: Every year you spend $30,000 on your BA Visa Card, you will receive a redemption voucher for a companion, valid for 2 years."