Bit late now but E-bay do have a complaints bit where they can do quite a lot about sellers misrepresenting their goods
Up to the point when they stop them selling and paypal have the same sort of thing but they can even grab the money back
There is no problem with a lot of E-bay sellers (Pro-jump sell via E-bay or used to) but you will find that if you get them from PJ you have a warrenty and they honour it
Is the seller still on E-bay if so go to the E-bay complaints bit and explain that they were miss-sold to you and although you realise it is late for a refund you feel that you were deliberately mislead and that you feel the seller should be reprimanded about it as they will not answer your e-mails or calls
At least that way you can get your own back a bit and you never know they may do something about a cheaper set of springs just to get E-bay off their backs
Jason