At 1200 today, my partner received 3 emails from Accor Plus within a minute.
The first was a notification that automatic renewal was turned on with instructions if she wanted not renew 2 days before her renewal date (30 September). The second, at exactly the same time, successfully renewed her membership (that she did not want), together with an invoice, and the third a minute later was a credit card receipt.
She does do not hold credit cards on the site for bookings but, somehow, they still had the card she used last year when she joined originally.
I'll let you know what they say in reply to her complaint.