Charging me with out aproval

Hello, from my account was charged 169 USD without my approval. I had a trial period for free and at no point didn't agreed to pay anything.  I am asking for a refund of 169 USD and an explanation of why this happened?  Please a quick reply!

Hello Karel,
Thank you for reaching AVG Support Community.
We will certainly check and help you with this.
Upon checking your email address which you used to contact us, there is no active AVG Subscriptions or trial orders in it. I've sent you an email requesting few details about the charge. Please check for the email and revert to us.
Thank you for your understanding.