Who called from 8652483020

Called my cell phone and when I answered the person hung up.

called my number but message, called rang once no answer

Keeps calling and try to answer but it hangs up. Called the number back and it rings twice and hangs up. How do I get them to stop calling?

Called my number,and would'nt say a word.

called my cell phone, said something about education and then asked me" tell me how you graduated high school?" I hung up