Oh... found a way.
If you attempt to cancel the automatic renewal, there's a last step "are you sure you want to cancel it? XX days left" etc etc.
Found out I have 38 days left ><
I started paying the day game came out with 180 days, thought they should be over by now, instead appearently I still have a lot of time before I can pay again and get my Behemoth mount Q_Q