Amazon have refunded 4 items I ordered nearly 4 weeks ago, received and have been using.
I can find no way to report this, either via email, via the web, via chat (god I hate those chatbots), via phone (it asked me to punch in a 3 digit code, but then hung up).
Since I cannot find a way to speak to a person or contact them to inform them of their mistake, shall I just keep the £. It's just over £50.
I don't feel particularly inclined to go round in loops of 'click here to contact us'.