Visa-netshort Web Unauthorized Subscription

I am writing regarding an unwanted subscription charge from Visa-netshort. I registered on the Visa-netshort website in the past and made a payment, assuming that it was a one‑time charge and not a recurring subscription. However, today at around 2:10 pm I noticed that an amount of 1,271.70 was charged again from my Union Bank account without my clear consent or intention to continue any subscription. I did not agree to any automatic renewal and I was not properly informed that further payments would be taken from my account on a recurring basis. For this reason, I consider this latest charge to be unauthorized and unfair. I request that Visa-netshort immediately cancels my subscription so that no further automatic charges are made to my Union Bank account without my permission, and that the amount of 1,271.70 charged today be fully refunded to me as soon as possible. I also ask for written confirmation that the subscription has been cancelled and that no more payments will be taken in the future.