Genius bar

Hi Guys after some advice please, I purchased an iphone 7 off Ebay was advertised as near new and immaculate condition with no scratches on, received phone and it had two deep scratches on screen, contacted ebay and seller within minutes of receiving it and the seller said i was a scammer and produced pics of the alleged phone saying there's no scratches on it and ebay have sided with the seller, I've got an appointment with the genius bar on Tuesday and a new screen will cost £136, would they tell me if it's already had a repair etc and do they replace just the screen or the phone? Regards carl