Why Avast denied to refund me £55 for an auto-renewal?

Why Avast denied to refund me £55 for an auto-renewal?

I was shocked to see that my Avast Security was renewed automatically without asking me anything, When I asked for a refund they denied that it should be informed within 30 days. What should I do next to receive a full refund from Avast Antivirus?

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