Got charged without my knowledge

I have been charged for a product that I know nothing about.
I did not recieve any notifications or activation key.
Please help because I cant cancel online due to the fact that I have no information to report otherwise than my bank account showing the deduction “Dri Avast”

Contact Sales: https://support.avast.com/contact
If you don’t have an order # use 00000000 then explain your problem.