iPhone 4 voicemail question

I have an iphone 4s, iOS 8.3 and I'm trying to figure out why the voicemail indicator is still lit up when I don't have any voicemails. I see the phone icon, and there's a red dot on it. I tap on it to open it, I can see "contacts' "recents", Keypad" and "voicemail". I tap on it to activate my cellphone company's voicemail feature. I check to see if I have any voicemails. I don't. Yet the voicemail icon has a red dot by it, which shows that I have a voicemail, but...
I don' t:confused:

I can't figure this out right now, so I leave it....
thanks for any clarity on this one

John b

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