I Can't Receive Text Messages From A Certain Contact In My Phone?

I am not sure if you are still having this issue but i thought i would shed some light on the situation. My girlfriend and I were having this issue as well and i found the problem. What happened was i had set her number as a spam number. If you press and hold the contact thread on the sms home screen (the screen that shows all your recent texts from different contacts) a sub screen will pop up asking if you want to set that number as a spam number. When you press set as spam you will not receive messages from them but they will from you. To reverse this, follow the same steps but press un-select as a spam number. And voila you can now receive messages

https://forums.androidcentral.com/sprint-samsung-galaxy-s4/390052-phone-not-receiving-texts-certain-people.html

Thanks