Unwanted charge, not know how to cancell it

on July i bought the avas antivirus for 19,99 and decided to try the cleanup thing ( which sucked). on august 8ish my credit card was charde with 49,99 dollars ! there was no where i can cancel the trial.

I went to the river page to get a refund. i explained the case and i got the refund for the antivirus( with my order id)

theres no order id or email or anything so i can ask for a refund or anything of the clean up.
literrally you scam me and i want my money back. ( im within the 30 day refund) >:( >:( >:(
[img src=“https://image.ibb.co/dfKkse/avast_2.png” alt=“avast_2” border=“0”]

https://support.avast.com/article/24/ (Orders/Renewals/Refunds)