receiving a monthly bill for an account that I don't have access to. Is there a way to get that account cancelled.

Hello.

I think it's a good idea to cancel your AWS account if you don't need it.
https://repost.aws/knowledge-center/close-aws-account

To cancel your AWS account, you will need to perform operations as a root user, so you will need to restore your email address and access your AWS account.
https://repost.aws/knowledge-center/admin-left-need-acct-access

If you contact AWS from the URL below, they may suggest other methods, so we recommend that you contact AWS once.
https://support.aws.amazon.com/#/contacts/aws-account-support/