I ran in to this "feature" in the US as well. I was the only party with my password and opening Netflix on a new device triggered a twice-over auto renewal, whi

I ran in to this "feature" in the US as well. I was the only party with my password and opening Netflix on a new device triggered a twice-over auto renewal, which their customer support confirmed is intended behavior. I had to charge back the prior month's renewal as well, as their support was unwilling to refund a charge from more than 7 days ago. Of course their cancellation numbers are low after the password sharing change - it's very easy to keep that revenue flowing if you're willing to borderline commit fraud to keep your customers.