You must have done something really wrong if they don’t even want to resolve this with you. Normally, you would receive an abuse notice from them — we did many times with one of the services I worked on. I guess your service is somehow connected to other Hetzner servers (not storage), or you are somehow leaking Hetzner IPs. Your servers were probably used to host CSAM or similar content, which is likely why they don’t want to communicate with you. Someone must have reported this to them.