Calendar alarm going off even when deleted

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http://androidforums.com – I have a Samsung Galaxy S2 running Android version 4.1.2 I have set up a reminder on the calendar to wake me up at 6.20 am every weekday. If I wake up early I will go into the calendar and delete the wake up reminder for that day. However, even though the reminder has gone from that day's calendar the alarm still goes off at 6.20 am. Anyone got any ideas on why this is happening please? Thanks for any replies. (General)