Numerous calls over the last two days.  When I recall the phone rings twice and then disconnects.  How do I block?

They called me 5 times for the last 2 days and left no messages. Called back and it is disconnected.

Received a call twice from this number - lsited as Ayrault's The Yard Baseball Academy

please stop calling my phone- we have no business together and I do not need the waste of time.