30 days free trial cancellation

Trying to ring you is absolutely hopeless.
I signed up today for 30 days free trial of some Avast product - I want to cancel - can you please confirm cancellation.
Judy

https://www.avast.com/faq.php?article=AVKB24#artTitle (Orders and Renewals)

To tell you the truth I am not sure even if it went through, as I did not respond to the order confirmation.

I looked at the site you sent - too complicated for me (but thanks for sending it) - I really want Avast themselves to let me know if it is cancelled.