Finally, having run the gauntlet of bots, who insisted that V.VIP wasn't available in my street, I have been upgraded. I had to Remain on my current tariff, but that's ok. I am told that CS will give me a loyalty discount.
Be patient. Be polite. Be insistent. Be prepared to call multiple times to get an operative who has initiative. Make sure you are forwarded to the department that actually actions the new package.