I unsubscribed from the monthly subscription but I still get the rewards

I don’t get it, I deleted Focus Quest and then I got a message; I’m not sure if it was from Gmail cuz I can’t find it. Anyway at the time the message was along the lines of ‘your subscription is still intact and you’ll have to pay, so do you want to unsubscribe’ and I vaguely remember that I did. This was one and a half months ago.

Fast forward to today, I reinstalled and I still can access all the rewards. I am vary of this glitch on my part cuz in future I don’t want to be forced to pay a massive amount of money to this app just because I couldn’t unsubscribe properly or the app had some issues.

Please help