Hi @Tracey63, welcome to our community!
If you do not have a backup where the text messages are included, you will not be able to retrieve them with any of our programs or apps. This goes for data in general, once it's deleted and it's not backed up / saved in the cloud or similar, you will not be able to restore it, as the device does not have a recycle bin or such.
Do you know if you have enabled automatic backup or done a manual backup of the data in the device where the text messages may be included?
