Hi Vinila Verma
Thanks for using Microsoft products and posting in the community.
I know you've had trouble canceling your account and I understand how you feel.
Since it's not clear where you want to delete or change your Microsoft account, here are a few scenarios for you to try if they work for your needs:
Depending on your board, if you want to logout or switch to another account in outlook.com (web version of Outlook), you can click the avatar in the upper right corner of the page. Click Logout to log out of the account, and then re-enter the account password; or click Sign in with another account to switch between the two accounts without logging out of the current account.
You can't add an alias that is already associated with another Microsoft account. It isn't possible to create a new alias using @hotmail, @live.com, or @msn.com.
If you remove an alias that's an email address from a Microsoft domain (like @hotmail.com, @live.com, @outlook.com, or @msn.com), you're permanently deleting the alias and it can't be associated with any Microsoft account again.
Other details about aliases can be found at this link: Add or remove an email alias in Outlook.com - Microsoft Support
If you want to close your Microsoft account, you will no longer be able to use any Microsoft products under that account. Before you close your account, take some time to take care of loose ends, cancel subscriptions, and make sure you haven't forgotten any important information, including files in OneDrive, content on Xbox, emails in Outlook.com, and more. Check out this link: How to close your Microsoft account - Microsoft Support
1、 Go to "Close Account" http://go.microsoft.com/fwlink/?LinkId=523898 and follow the instructions to log in.
2、 Check that the page shows the Microsoft account you wish to close, then click Next.
3、 Read through the list and click the checkboxes to confirm that you have read each item.
4、 In the Select Reason drop-down list, select the reason why you are closing the account.
5、Click Mark Account as Closed.
I hope this information has been helpful. If you have any questions, please let me know and I will be happy to help.
Forry-MSFT | Microsoft Community Support Specialist