I can't delete iPhone texts?

I decided to delete most of my texts because they were taking up a huge amount of space on my iPhone. However, one of my conversations won't go away. When I delete it, everything seems fine until I close the app and reopen it. When I open it, all of my other messages are gone. When I restart the phone, the messages I want to keep are back, but so is the one I tried to delete. I have seen this question asked before, but have not found a solid answer yet. Has anyone since figured out how to get around this bug?

Its a simple solution that I'm not sure if it could work tho.

Restart your phone, just turn it off, leave it off for about a few minuets and then turn it back on.

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