Welcome to the forum. :flower:
I think I remember seeing that drive just before Christmas. I'm looking at the listing right now. A Pioneer drive with BurnerMAX firmware just didn't sound right. And a seller with zero feedback... it looks like they bought the drive thinking it would work with BurnerMAX, realised their mistake and created a new account to fraudulently recover their losses. With a careful search of the completed listings you might be able to find their 'true identity', if they bought it off Ebay in the first place.
It isn't my area of expertise, but my understanding is that the BurnerMAX firmware was only released was for the Lite-On iHAS 'B' series drives. So you should have a cast iron case of the drive not being as described.
The BurnerMAX modified firmware is unnecessary now, as ImgBurn can send the payload. The bad news is that according to this list the Pioneer DVR-115D isn't supported.
As you have such a strong case for claiming a refund, I would strongly urge you not to try crossflashing the drive to a DVR-115L while the case is being processed. It could prevent you from receiving a refund, as the seller can legitimately argue that the goods were not returned in the same condition in which they were sold.
If you wish to keep the drive then you can try to negotiate a partial refund. But as the seller has not responded the most likely scenario is that Ebay will rule in you favour and refund you. If the seller wants the drive back they will have to reveal their true address for you to send the drive to. But I doubt they will want to do this, as I suspect they have emptied their Paypal account and won't want Ebay/Paypal pursuing them for the money owed for your refund. So if you are very lucky you might end up keeping the drive anyway.
You are not the first to be conned in this way.