Reminders app hogging memory - and it's not even on my phone anymore

Hi,

After one of the recent updates, I discovered that my Reminders app is taking up almost 20 GB of memory. I deleted reminders (incomplete and completed) and eventually removed the app completely. I have rebooted several times.

The app still takes up the memory AND it is still sending me reminders!!

Please advise how something that isn't even loaded on my phone is still behaving as if it is present and active - and eating up a huge chunk of memory. And, more importantly, please advise how to resolve this.

Thanks.