Repeated calls from this number.

Just got a call from this number, didn't answer, googled while ringing and this page came back

Sent to VM on first ring, no message was left. Called back using *67 prefix, number doesn't ring and there are no sounds or out of service or other messages, then the call drops after 30 secs.

No message.  Called back. Did not ring.

No message left. Now blocked!