Security on Free AVG

Hello Jo.
If you would like to request a data deletion from AVG, please visit https://www.avg.com/gdpr, enter your email address and click Request Access. Then, please check your inbox > click "Go to Portal" button > Support > scroll down and submit a request for data deletion.

I haven't used the Free version of AVG since 2014 & its not on my system, however I was able to login to my old AVG account today 25 Nov 2020 using the same email address and password. It appears a password of mine has been hacked and is being used by the dark web, 

I would be glad if you can advise how I can disable the account and login to the Free version of AVG I used back in 2014 and remove my details from the AVG login.
If you can help please let me know.

Hello Jo.
If you would like to request a data deletion from AVG, please visit https://www.avg.com/gdpr, enter your email address and click Request Access. Then, please check your inbox > click "Go to Portal" button > Support > scroll down and submit a request for data deletion.