Trying to unsubscribe to VPN

I find I no longer need VPN protection and have asked Avast to unsubscribe my account. BUT they keep sending me bulletins telling me its expired. EVERY DAY. Numerous times a day. I’m not a computer expert. These are NOT emails, but Pop up on my laptop even when I am not connected to the web. How do I request them to stop?

See if these help.

Sales - Orders and Renewals FAQ - https://support.avast.com/en-ww/article/Alternative-unsubscribe/.
Scroll down to the “How do I cancel automatic renewal of my Avast subscription?” option.

Also see - Cancelling automatic renewal of the Avast subscription - See https://support.avast.com/en-en/article/35.