How to cancel services?

You will need to login to the account and go to the "Billing and Cost Management" console. There you will be able to see the individual resources for which you are being billed. One by one, you will need to go to the various console sections and remove/terminate the resources. Once you have terminated all the resources, contact support to close the account -- leaving it open is a vector by which someone could hack the account and create resources in the future.

Hope this helps!

The tone of your question makes it sounds like you're not all that familiar with Amazon Web Services, would that be fair to say?

If you have an AWS account you can login to it at https://console.aws.amazon.com/ and from here you can go to Billing and Cost Management and drill down to see what's accruing charges https://console.aws.amazon.com/costmanagement/home#/home

If you can't login to AWS Console then the steps here can help you https://docs.aws.amazon.com/signin/latest/userguide/troubleshooting-sign-in-issues.html

If you still can't sign in then contact AWS Support https://support.aws.amazon.com/#/contacts/aws-account-support/

Include as much information as you can, including email address and the account number that is on the invoice you received. For you own security don't post these details on any replies or comments here though.