How can i reject incoming text from a certain number

[AC Question]

How can i reject a certain person to text me or call me on my lg ?

 

[STARGATE]

I'm not sure on LG, I'll check with my brother, he has the G4.
With Samsung, you go to a menu while on that message and it has the option to add that phone number to spam.
Try that on your LG to see if it works.