has rung me multiple times, when I answer 'hello' I get no response. I wait a couple of seconds and still get nothing so I hang up

I called back number 0425 498 294 rang once then gets disconnected automatically.

Caller: Solar telemarketer

Rang me and asked to speak to home owner. Advise the caller I was renting. Apologised and hung up 30 minutes later received two more calls which hung up on answering.