Hmmm I would still haggle, some business is better than no business and the fact the website has not been updated is sloppy, an opportunity to get all car boot sale on their **** ;)
play the innocent - you saw the offer phoned up you then feign disappointment and talk about the prodrive pack that is cheaper, from somewhere else of course
in fact we do have some discounts linked to the forum - check those out as well, it may throw up something
http://uk.subaruownersclub.com/forums/forum/37-subaru-owners-club-company-discounts/