You have gone about this in the wrong way.
The first controller you received was faulty so you needed to open a "Not as described" case. Your seller would have been forced by ebay to send you a tracked return label so you could return for a full refund. If he failed to send you a label you would have escalated the case and ebay would refund you.
It sounds like you may have opened a "Not received" case which you would lose because you did receive it.
If the second controller is also faulty you should open a second "Not as described" case.
Don't talk to the seller, just stick with the cases.
Read the Ebay money back guarantee, link on every listing.
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