IPhone 6 keeps saying I have a voicemail but I don't?

My iPhone 6 keeps saying I have a voicemail but when I ring voice mail it says my mail box is empty? Has anyone else had this problem before? It's done it a few times and usually when I get someone to ring me up and leave a blank voicemail so I can delete it, it goes but doesn't seem to be working this time, tried restarting phone and leaving a voice mail but doesn't seem to work & the voicemail I leave doesn't come through onto my phone:/ thank you for any help.

Call it and leave another voice mail then clear it all.

You may have saved voice mails

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