How to block stranger in my imessages?

This random number keeps messaging and calling me. They are not on my contacts list so i don't know how to block them. My ios is ios 10.2.1 and i have an iphone 7. They said that they will try to call me at this certain time and they said thank you for signing up for this website. I was really curious and i never heard of that website so after i got the emssage from the stranger i searched it up but it isn't real. How do i stop them from annoying me? I have never given anyone my number before i only have my parents phone number and there contact on my imessage app

I use the Mr. Number app to block those calls, but they can still leave a voicemail

Bahaj

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