How to permanently delete all my iphone text messages?

I have loads of texts from like 2012/13 on my iPhone and every time I delete them all individually! The next time I turn my phone on and off all the messages are back! It's really annoying and my phone goes really slow coz of it! Can someone help please

Have you tried syncing your iPhone with iTunes? The reason this might happen is because when you "delete" the messages, they aren't completely removed from your phone until you sync it with iTunes.

Delete the items from your phone, then use your wire (from your charger) to connect your phone to your computer. Open up iTunes on your computer and try to access your phone. It should perform a backup and sync your phone with iTunes. This should permanently delete the messages. (Hopefully xD)

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