You deserve to get return shipping refunded. Email the seller through ebay and if he says anything but yes make a case with ebay. Warn him this is your intention if he does not do an immediate refund for the parts and return shipping. Hell, I would make him send you a prepaid ups label and then have ups come and pick it up at his expense.

I do not tolerate monkey business sellers like this and I have won every single time. Sometimes they even let me keep the junk part for free.

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2004 E60 545i Sport 6MT. Black/Black Build Date 6-2004 102k miles