How to block spamming SMS

I am using a MOTO-G6 and it runs on Android-8.0.0. the default SMS app is Google-Messages. I am getting tons of annoying spam SMS from contacts with no numbers. It just shows a name for example: VKHLTCHK HPFAMDOC HPYESBNK ... ... I can block these contacts, But I still do receive sms from these over and over again. Has anyone have this kind of problem. How do you solve this? I am willing to buy a paid app if it exists.