ABT12, that sounds like a horrible experience. I had mentioned the reason I did not pay for shipping was a negotiated agreement. I did not elaborate though. Maybe now relevant as has some similarities almost happened with my purchase process. For some background, I did spend some time MANY years ago as an F/I manager at a branded dealership and had family in the business as well. I know the business.
Your problem sounds like things I have heard before. As a note, dealers receive back end fees from finance companies if you use their financing. There is no prepayment penalty I am aware of in auto finance contracts, so if you accepted it and paid it off after you received car, should be no cost to you (I have not seen your contract, so could be different in CA.) Also those superseding fine print details generally are standard (but I thought only applied to new cars that are ordered as sometimes price can change during production, and car comes in with a higher sticker price). Again having not seen the docs, can't be certain. Overall sounds like a really unprofessional experience though.
After I found my car on line, I had questions for the salesperson. I wanted to know a few things. Were the tires replaced as 8 year old car and could be expired, do they do a 40K service (CPO calls for all scheduled service due within 6 months be completed). I was concerned 40K service might not be considered required, as car only had 7800 miles on it, but it should get it due to age.
Salesperson got back to and confirmed with his manager that all tires would be replaced with new and 40K service would be done as well. I was thrilled, and agreed to purchase car. I just wanted to receive a copy of the CPO report and the shop order for the service to confirm all was done. I asked for a total cash due amount so I could wire them the money and have car shipped (at my expense).
When I received the invoice, it had close to $1000 in "dealer fees" added. I called to ask what that was all about. They said all Florida dealers charge this, and it includes DMV processing. I noted that I am doing all of my DMV and tax paperwork in NY, so why should I pay. Ultimately, they reduced this fee to $499. Really, they should just call this "additional dealer profit" as that is all that it is. It is a "gotcha" fee. I reluctantly agreed to total as I really wanted this vehicle, and wired the money. I do know this is common, and the reduced fee was more in line with what other dealers charged.
Now the trouble began. After my money was received, I get a call that there is "a problem". The tires and 40K service were meant for another very similar Boxster on the lot at same time. I even knew the car, as I was considering it as well. I was upset about this, and manager offered to unwind the deal and return my money as they said was an "honest" mistake. I asked if I could just buy the other car, but they said it was already sold to someone else. Used car manager offered a counter offer of paying my shipping as apology, but would not do the 40K service. Still not good enough for me. I escalated to the GM of the entire franchise. I explained when a business makes a mistake, it should not become the purchaser's problem. Business's should take it on the chin and do right thing. Ultimately, they paid the shipping and did the service, so my confidence was restored in this dealer's integrity.
What I received was a car that had a bad battery, wrong battery, an unresolved electrical problem killing the battery, and missing parts required in the 40K service (no cabin air filters changed, although they did send them to me after my complaint to service manager). However am out of pocket for a new battery, and now I have to resolve electrical issue with local dealer on my time.
That is where I stand now. So I share your pain in dealing with some dealerships. I expect we don't name names (although maybe should to alert other buyers, but it may just be an isolated experience). I trust that Porsche NA has a higher level of accountability than this. May write them, if consensus is that there is any real recourse available other than venting steam.