Phone ebay/paypal and explain exactly what you have told us. Even if the seller has now changed the advert your item will still display the listing as it was when you purchased the item, therefore you can show them that the seller has now altered the listing. If you bleat on using key words like "robbed, conned, scammed, I knew I shouldn't have used ebay, distressed, upset" etc they will bend over backwards and find in your favour.
Send the cv joints back (by recorded delivery) and demand a full refund as they were not what you actually wanted and ordered.
Ebay should find in your favour.
Then reorder the CV joints from the same seller if they will actually solve your problem.