AVG subscription

I thought that I had cancelled my subscription but the payment has appeared on my Visa. How do I reverse this please?

Hello Jenny,
We apologize for the inconvenience caused.
Please click this link to apply for refund - https://support.avg.com/RefundForm
Thank you.
Joyson, AVG Customer Care.

Hello Jenny,
We apologize for the inconvenience caused.
Please click this link to apply for refund - https://support.avg.com/RefundForm
Thank you.
Joyson, AVG Customer Care.