Unauthorized Charges -How to Contact

How do you get in touch with this company ? They charged my credit card for something that I didn`t order. There seems to be no way to contact them and get it corrected. Any suggestions ?

Hello Robert,
I see that you have already contacted our chat support team for AVG Internet Security activation using new license number.
However, the charges was for AVG Internet Security automatic renewal. Feel free to contact us again if you need any further assistance.
Best regards,
Alok.

Hello Robert,
I see that you have already contacted our chat support team for AVG Internet Security activation using new license number.
However, the charges was for AVG Internet Security automatic renewal. Feel free to contact us again if you need any further assistance.
Best regards,
Alok.