All that I know is that I paid by the month and wasn’t told my benefits would run out at the end of my full year. My notice when I cancelled said that if I cancelled now my benefits would stop on 1/13/2021. I had three days left in the month and I haven’t been on it a year. I have only had it since May 2020. Here is a snip of the email. I cancelled on the 10th of this month.
“We are confirming that you have opted to end your Prime membership. You will continue to have access to your benefits until your membership period ends on January 13, 2021.
If you would like to stay with Prime, click the button below and we’ll make sure your benefits continue uninterrupted.”
I was on the Prime Monthly Plan at $12.99 a month.
You are one of the lucky ones. Most are on annual. Mines up in April I believe.