How to stop facebook from accessing calendar on iPhone?

I made my calendar hide the birthdays of people from facebook because otherwise i have no idea what's going on on different days, but when i drag down the screen that tells you the messages and weather and stuff like that (the notification center) the calendar birthdays are still there. Is there anyway to make this stop? The only reason i synced facebook to my phone was to get the contact information of my friends, but i didn't really want it to mess with the calendar… I turned it off in settings but the birthdays are all still there. Any way around this? Any help's appreciated, thanks!

You can delete that calendar application from this link https://www.facebook.com/...plications

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