I have had to contact Amazon.com.au after I started getting a monthly $6.99 charge out of my credit card for a membership my wife or I did not knowingly sign up for. We shop online constantly and this has never occurred before as we consider ourselves knowledgeable in this space. Apparently they automatically do this when you purchase an item (which we had done) on their website with a ‘non standard delivery’ selection e.g. not the normal default shipping method. This was not clear on their site at the time of purchase. When you do go to their site to cancel the unsolicited membership it requires multiple layers of pages and selections to remove the membership. Technically they owe me $13.98 but I could not be bothered going through the rigmarole of getting it refunded.
Thanks for letting us know about this quirk with Amazon.
You could approach your credit card provider and ask for a charge reversal as you didn’t agree to the charge. Not much effort involved there.