Cancel subscription

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I want to cancel my subscriptions. Is there anyone who can help me.

I recently cancelled all my subscriptions and received e-mails confirming this. I find today AVG have asked my bank for a payment of £59.99. The bank have not paid this but it is still pending in my bank account. I received a message from AVG telling me it had been refused but they wont let go. f anyone from AVG read this the reference I was given is 25294829. Be careful, the dont want to let go.