How can i block text messages on a samsung galaxy s6 through straight talk

[AC Question]

I dont have the spam filter

 

[X1tymez]

You can use third parties app in Google play store. There's ton of them, but my favorite "Textra"

 

[ManiacJoe]

Your texting app should have the option to "block" or "reject" text messages from any individual number.
View the conversation, select a message from the number to block, tap the 3-dot menu. block/reject should be an option, assuming a reasonable texting app.

+1 on the recommendation for "Textra" SMS app, if you don't like the app you are currently using.