From their profile, click on the "gear-shaped switch" and you'll see a choice to block the individual as well as they can't call you from that account any type of longer.
Site na profaịlụ ha, pịa "bọtịnụ gear-shaped" na ị ga-ahụ nhọrọ iji gbochi onye ọrụ ahụ ma ha enweghị ike ịkpọtụrụ gị na akaụntụ ahụ.