Just hangs up when calls you. spam

Caller: ‭0488 838 061‬

This is the third day I have received calls from ‭0488 838 061‬. When I answer the line is silent ???

Had a few calls from this no. Picked up initially to which I had no response from the other side and Subsequently stopped picking up

answered by machine says call is important you will be answered by next available agent

I called back the number 0488 838 061 spoke with a guy but couldn't hear him when he mentioned the company name

No company name and hangs up on you armfter putting you on hold

When you call back it goes to a prerecorded message that your call is important and to stay on the line, then hangs up. doesn't mention a company name