You'd be surprised how often this happens. I had a similar situation with someone who accidentally used my email when buying a new car.
For a while I was getting emails from the Hyundai dealership that had auto-login links that would have let me do all kinds of things, including requesting a (paid) tow of the car from my house back to the dealership, scheduling (or cancelling) maintenance, ordering extras and part, and more..
Luckily through that logged-in area I was able to find the individual's phone number and we texted back and forth until he understood the problem and called his dealership to update his info.
This is genuinely amazing to me. And the IT guy that set up that Hyundai system is probably getting paid plenty to do it, despite massive flaws like this.
For a while I was getting emails from the Hyundai dealership that had auto-login links that would have let me do all kinds of things, including requesting a (paid) tow of the car from my house back to the dealership, scheduling (or cancelling) maintenance, ordering extras and part, and more..
Luckily through that logged-in area I was able to find the individual's phone number and we texted back and forth until he understood the problem and called his dealership to update his info.