Como cancelar na fatura do cartão assinatura que não foi solicitada?

Gostaria de saber como posso cancelar assinatura no meu cartao de credito sendo que a mesma nao foi solicitada por mim?

First, I’m an Avast user and not an Avast Team member.
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What program was this for ?

The one I’m thinking about is the 30/60 day ‘Free Trial’ of say Avast Premium Security, to get this Free Trial you ordinarilly would have to complete a Payment Mandate that will be actioned close to that date, if you haven’t cancelled that Payment Mandate in advance.

This is I believe the only way that they would have got your banking details to setup a payment mandate.