I had an account with AWS about 6 years for a small prototype and I closed it after using it for 1 month. However for some reason I got an email last November about a change to some certificates for either S3 or Cloudfront because my account used one of those services in the last 6 months.

I don't know if this is a mistake on their part, but I haven't been charged in the last 6 years or gotten any emails before that. But it's still worrying because the account is closed and I have no way through standard support to know why they think my account was using their services