According to Google AI, the highest iOS version you can officially install on an iPhone 7 is iOS 15.
You can still access eBay via their website www.ebay.co.uk on a computer, mobile phone or tablet.
I have no connection with eBay or work for them, apart from being a customer. If you contact eBay, be firm and express your feelings. Please bear in mind, the people at the other end are employees, just like you and me (until I retired). Please be polite and respectful. You’re more likely to be listened to.
