I bought Avast antivirus for £20 on 27th Sept. I did not realise it was just for one computer so a few minutes after buying it I contacted Avast through their website and requested a refund I recieved no reply. So I messaged again. Still no reply. I have posted on several of the Facebook posts about this issue and was told to contact Avast via Facebook messenger. I have done this but still no one replies to me. I just want my £20 refunded and am despairing of ever getting it. What can I do?