I don't think apple support will respond to you here but if your iphone is recent try calling them or going to the location if the previous response doesn't work for you. You may even have to restore your iphone with a wired connection to a computer to itunes as I've been there and that was the only option I had at that time.
https://youtu.be/un2hQF0B0i4 hope this helps
Thanks! Your answer is awaiting moderation.