This number is Red Energy. Either block on your mobile or answer and tell them politely not to call again because they will just keep calling daily. I think it is an auto dial system.
I was a former customer of Red and I have no complaints about them, except for being stalkers....

Hi "Rose" -- So you are now spamming the spam boards, huh? LOL

You're brazen, if a tad dim.

Red Energy. Pests and a waste of space. Hang up.

It's Red Energy. Trying to give you an offer or chase you about a debt! Either way I say don't answer!

No answer when the call is picked up, disconnects after a few moment. One call a day recently.

Red Energy 2 calls in 2 hours.
Hang up when answering machine kicks in...

Non stop missed calls from this number, with no message. I have just blocked them.

Called me once a day for the last week, answer and hold music.....

Definitely red energy trying to sign you up. Hang up. Products no good anyway..

Calls several times per day for last week and a half and won't leave message. I assumed Red Energy calling as I'm switching to another provider so when I finally answered there was silence and they hung up. Probably autodialer but I've had enough and blocked them. Pests!

Claims to be Red energy. 6 calls in 2 hours, they don't leave messages

it's not red energy you bunch of twits, it's indian scammers who are a runaway train that no body can be bothered to stop them scamming our money.

Had several calls from this number, no one talks when I answer it.

spam

Spam

One call every other day
No one is on the other line

Number has called me 3 times in 10 min on mobile, no message left, annoying

1 call per day then it hangs up.... nice to know it's a scam.

Have had 6 calls since Wednesday (it's Friday now). I answered the first time and there was that gap of weird silence that lets you know its a telemarketer so I hung up. As I did I heard a click on the other end.

Ringing my mobile. I am a customer with Red Energy but this persistent ringing is ridiculous.
Now I just decline the call. No messages left, same as other people are commenting.

They try sequences of numbers - if they try (03) 9876 5432, (03) 9876 5433, and (03) 9876 5434 in succession, they won't care (or know) that 03 9876 5433 is "silent" or not...they're just scrolling through numbers...