How do i get a refund for unauthorised auto renewal?

Norton products (including subscriptions and Automatic Renewals) may be refunded within 60 days of the purchase date.

The instructions to obtain a refund varies depending on where you made the purchase. Please choose one of the following depending on your purchase:

• Request a refund for an annual renewal fee

• Request a refund for your purchase

• Apple App Store product returns

• Refund for a Norton product or service that came from service provider

https://support.norton.com/sp/en/us/home/current/solutions/kb20100512172507

Please review > Requesting a Norton Automatic Renewal refund
https://support.norton.com/sp/en/us/home/current/solutions/v58152553

Please review > NortonLifeLock Cancellation and Refund Policy
https://support.norton.com/sp/en/us/home/current/solutions/kb2010011316402

Please check your Norton account to confirm ... Automatic Renewal Off ... and no billing information. 
MY SUBSCRIPTIONS reports:  Activate Subscription Renewal ... with Automatic Renewal Off.  

BILLING INFORMATION reports:  There is no billing profile saved in your account ... with no billing information.

https://my.norton.com/extspa/account/subscriptions

Stop your Norton subscription from automatically renewing
https://support.norton.com/sp/en/us/home/current/solutions/kb20090818144126EN

Users may contact Norton Support regarding refund:  

• Contact Norton Support - Chat 
  https://support.norton.com/sp/en/us/home/current/contact-chat
• Contact Norton Support - Phone 
  https://support.norton.com/sp/en/us/home/current/contact-phone