I got a mail from aws i have terminated the instances but it is still showing the used all the services.
Dear AWS Customer,
Your AWS account <account number> has exceeded 85% of the usage limit for one or more AWS free Tier-eligible services for the month of March.
AWS Free Tier Usage: 26.2097 GB-Mo
AWS Free Tier Usage Limit: 30 GB of Amazon Elastic Block Storage in any combination of General Purpose