How to delete a voice mail on an iPhone?

Yes I have tried swiping and deleting and I have tried the big red delete button. But for some reason 2 of my voicemails refuse to be sent to the deleted messages part of the voicemail box.

Added (1). Amy you clearly did not read my paragraph under my question as I have tried that

Go to your green icon where you can view who has called you. Then go touch "voicemail" once you get there you can swipe across and the red delete icon will appear, if you touch that the voicemail will be deleted. You can also highlight the person who has called you by touching it and then touching the delete icon at the bottom.

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