It appears to be legit.
https://www.vodafone.com.au/support/contact/customer-care

They rang my husband's phone and I picked up. then said they want to speak to me about giving me better value. They then asked how much I was paying and I advised them that if they were from vodafone they would know that and I hung up

I just got one. They even sent a text message saying that I was speaking with an Vodafone team member and needed my pin to discuss upgrading plans as they had recently been advised. Advised her that Vodafone have advised they will never ask for a pin on an incoming call and hung up on her,

They just rang me for 2nd time. No answer when you pick up....even left voicemail msg full of silence. This has happened before about 8 years ago...maybe I need to change my number! Love reverse directory, now I can get on with my day!

It's spam - Unsolicited phone calls from Vodafone.

Silent for about 40 seconds
Bastards

Spam

asked for security code. I hung up. If I want a new deal, I'll enquire myself!

Called at 7.30pm at night so definitely not a professional number. Don't trust it.

DONT ANSWER - THIS IS A SCAM
THEY HAVE PHONED ME FEW TIMES RECENTLY
JUST HANG UP WHEN YOU SEE THE NUMBER
OR ENTER IT INTO YOUR PHONE AS 'SCAM' TO REMIND YOU
SIMILAR CALLS FROM (02) 9934 8400; (02) 6188 5917; (02) 9482 2473
WISH THE POLICE OR REGULATORS WOULD ACT ON THEM OR ARREST THEM

Is definitely Vodafone with upgrade offer, they sent a text message to confirm it was then while I was on the call, then two confirmation text messages after with all the details discussed.

Pretty much ended this when they asked my PIN. This may be vodafone but very unprofessional to ask this information. If you ring them then fine, you know who you are giving your PIN to, but this could be anyone who has my mobile number and with my PIN number they can cause all sorts of havoc to my account. Bad practice if its vodafone doing this.

Called me today 19/3/18 12PM - said I'm not interested in what they have to say, they were pretty pushy about me staing on the phone to listen to them.. I hung up

He started with 'Hi I'm from Vodafone, just ringing because you're a premium customer and we could talk about how to cut down on how much you spend each month. Then said since I'm a premium customer I can buy a tablet for just $15. Then he said would you like to go ahead now and purchase a table for just $15 per month. When I said no he said 'okay, does anyone in your family have a phone with rechargeable credit?'. When I said no he said 'Okay thank you for your time' and hung up immediately. You cannot convince me vodafone is paying anyone to do that.

The tablet pitch is a way to get you to pay them, and the question about rechargeable credit is another way for them to scam you through the use of itunes gift cards etc.

Low lives.

This number consistently calls me and they don't say anything when you answer the call so i just hung up

I just received a call from this number...I answered and said "hello" - no reply. I said "hello" again and a man replied in a very muffled voice with a very strong accent saying who knows what as it was completely incoherent & then he hung up. I panicked as I thought I might have been the victim of one of those scam callers who hack into your phone & so I dialled the number back only to hear a Vodafone recorded message saying "Hi there, we recently contacted you....."

Hey Vodafone - you didn't recently contact me - you basically freaked me out thinking that I was being hacked. Not impressed. Go away Vodafone!!

They have been calling me every day for a week now. Thanks to all of you I know it's a scam! The number is now blocked!

I have not answered any of the 12 calls from this number. Talk to your local Vodaphone representative first as i did. And never give up your pin . This is scam. Beware

As soon as I answered, they hung-up.

They were offering to upgrade my plan as they noticed I went over my usage last month and were offering additional 3GB data for an extra $10. Not a good deal as the deals online were showing a lot more data for the same price - questioned this and was able to get a lot more data for the same price.