Cannot stop Outlook.com emails being forwarded to Gmail.com

Few days back after switching from Hotmail.com to Outlook.com, I decided to 'add an alias'.

https://account.live.com/AddAssocId

I chose 'Add an existing email address as a Microsoft account alias' and added my Gmail.com email id as an alias. It then redirected me to 'Trueswitch.com' page where I entered all the required details. Since then all emails are being forwarded to my gmail email account as soon as they arrive in my Outlook.com email account. I want to stop these emails being forwarded to Gmail now. Please suggest.

1. Checked 'Outlook.com Inbox>Options>Email forwarding' in 'More mail settings'. I have not set up email forwarding there.

2. Checked 'Gmail.com > Settings > Accounts >Check mail from other accounts (using POP3)'. I have not setup checking email from other accounts via POP in Gmail.

3. Removed my Gmail.com alias from Outlook.com.

4. Contacted Trueswitch. They asked me to change the passwords of both my gmail and Outlook.com account. Didnt help. Emails are still being forwarded to Gmail.

5. Trueswitch finally asked me to contact Microsoft support, as Trueswitch is now shut and provide minimal support.