I had this same experience several years ago - someone signed up for an apple ID using my corporate email. I escalated it via the phone tree, and eventually got

I had this same experience several years ago - someone signed up for an apple ID using my corporate email. I escalated it via the phone tree, and eventually got a phone call back from some sort of manager who was able to detach my email without otherwise disrupting the person's account. I suspect that your best bet is to use the phone support via TTY. As a non-apple customer, I was very impressed by their dedication to resolving my issue, and I hope/suspect that if you can get your case escalated they will find a way to communicate with you without audio or sign. But getting to that point may require an initial interaction with the phone system. My experience did not lead to any linkage between my phone number and the problematic iCloud account.