Two of my devices are showing a registered to someone else

My Ring video doorbell has been playing up so I decided to reinstall it. I have a Ring chime Pro so I first reset that then went to add the doorbell to it. It tells me the device is registered to someone else which is impossible because I'm the only person who has owned it. I tried to request a transfer by sending an email (thinking it would come to me), no such luck. Now I'm stuck with an unusable device and to cap it I've just reinstalled my kitchen chime and that says it's registered to someone else as well. End of my tether, please help.