Funds taken without my authorization

I just had a check of my bank account and it seems $79.90 was taken out by a name Digital River Ireland-or AVG. I gave no authorization for this money to be taken out and I'd like it returned. I'm on a low income pension currently and need this money to live.

 

I did receive a message around that time saying to renew my subscription but I did not choose to do so as I'm with AV now. Why did AVG take money out of my account without my permission?

Hello Philippa,

We acknowledge your refund request.
The charge would have went through due to auto renewal enabled for the license.
We couldn't find a subscription under this ******@hotmail.com email address.
If you have used a different email address at the time of purchase, do mention it.
I have sent an email for you to provide the email address.
Once we receive the information, will try to locate the account and assist further.
Hello Philippa,

We acknowledge your refund request.
The charge would have went through due to auto renewal enabled for the license.
We couldn't find a subscription under this ******@hotmail.com email address.
If you have used a different email address at the time of purchase, do mention it.
I have sent an email for you to provide the email address.
Once we receive the information, will try to locate the account and assist further.