[speeder]

This guy,("broker"), needs to be investigated with a baseball bat and a set of very large pliers. Oh, forgive my mood, I just got reamed myself on a long-distance transaction. First-time e-bay buyer, old motorcycle.
I hope like hell you get some relief from this guy. What state is he in? Maybe I can help. You did not say what year this vehicle is, but I'm assuming 70-73. Prices for nice original 911S's have definitely climbed high. I would go as far as to say that one can buy 2-3 perfect 911T's for the price of a good 911S. One could order a 911T with "S package" option- guages, fuchs rims and deco trim. Nice option, but since approximately 99% of 911T's sold in U.S. had it, it means NOTHING in the context of this case.
In the early 70's, Porsche sold probably 7 or 8 911T's for every S or E. There was a very significant difference in price and performance. Don't get me wrong- in certain ways the 911T was the "best" car for a heck of a lot of people and very respectable performance. Try to imagine if Porsche today sold a new 911 that only went 140 MPH instead of 175,(996 top speed). The car was absolutely the same car except for performance and a tiny badge on rear. Price would be $30,000 less than current model. ( proportionally correct to 911T:S pricing in 1972). They would sell 10-15 "T"'s for every "S". The "S" would be a rare animal when new, not to mention 30 years later.
So much for history lesson, you have been scammed and must get relief. If car you bought is a nice T, maybe keep it and get at least half your money back. If you are not very fluent in Porsches, it might be a better car for you, unless you can afford Jerry Seinfeld-type maintenence. These cars are getting old, and if regularly driven, even the good ones need a lot of care.
Good luck, keep us posted. I definitely think that you should Identify this seller, but talk to your lawyer and see if it's OK first. Wish you well, you're probably a gent by tone of letter.