Payment taken without consent/refund request & UK contact number?

Hi, I had a phisphing scam and in haste I bought Avast Premium for £23 pounds. However I have had an additional c. £17 taken from my account. I am in the UK and cant find a contact number to query?

I had requested a refund for the Avast Premium (ref. 101566257) but had no autoreply email. And I want to find out why additional money has been taken without my consent?

Can anyone help or have a UK contact number?

Thankyou

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