The Polaris 6 month 'free' key holding service moved around Sept / Oct last year to a company called Gesfin based on La Torre. I had a private key holder that did not work out for several reasons, so we visited Gesfin and switched; €100 per year for key holding, and they offer for an extra €25 a 24x7 helpline service via a 3rd party. All seems to be well so far, reasonably responsive to emails and easy access on la torre...
As mentioned by previous author the call centre has moved to Mar Menor II - post sale issues are dealt with by Customer Services at PW HQ offices, a chap called Fernando Para - yes just one person!
Re all the issues on delivering of buildings / lack of responses etc, I really do sympathise with this, the financial situation in Spain as a whole is not helping, never mind the PW debt issues around the same time in 2009 and 2008. I would say this is the reason for the response issues - a massive reduction of staff due to handing a lot of the assets over to the banks, all business would do this, quite why PW would take so long to take such action is, well, just not good business. PW have always been a good sales engine, and always been a poor aftersales service, hopefully the financial shake up will keep them focused on core activities.
Just a personal view would be to try and deal with these issues face to face as much as possible, I am aware PW are offering people the opportunity to move to P2 apartments already built with a discount as some phases will not be complete for another 10months at best