I did not remember to change my credit card in Google Play when the old one expired. Now I just got mail that my Key subscription is cancelled and no help how to renew it.
Same problem, did you get any answer? Did't find any instructions on google plays helps.
Did not get any help, finally I just uninstalled Key and then installed it again and bought new license. Account was still working after that and data was there. Just have to sync every device again.