Same issue as EJ above - does anyone know how to block a number from calling?

3 Calls no answer & no message

one call and when i call back it goe funny when they say who they are

it rings everyday and when i pick it up it hangs up straight away

i called this number and its a phone company for multiple companies, the automated voice said they will continue to call us until they reach us. looks like we will have lots of calls to from this number as they keep hangin up when you answer!!!!!! its basically impossible to find out which company is calling us