Damaged item delivered by Evri

I sold a camera and lens to a customer, the item was delivered by Evri quite clearly damaged, the buyer wants to keep the cameras but return the lens, i can't speak to Evri they refer me back to eBay, so what do i do, is it a case of the customer just didn't want the lens supplied and wants a better price on the camera, he has now bought another lens or do i offer a further discount, either way i lose