Just found a fee (2 June) for US$12.99 - NZ$19.08 as monthly membership for Amazon Prime.
I don't remember signing up.
I made an Amazon purchase back in January...
Apparently I may have clicked on a 'trial' button which converts to full membership after 6 months.
I have ended membership now... If I haven't used the services since the fee started I will get a refund.
Here's hoping for a refund.