DHL supply chain calling about a scheduled delivery

I called back the number. An automated voice says "You will enter an Echo test. Everything you say will be repeated back to you." I hung up then.

DHL Customer Service following up on delivery

Called back and had an automated voice saying something about voice recognition. I hung up.

Caller: DHL Supply Chain

Calling to arrange delivery pickup

Caller: DHL

DHL among other things, are the contracted providers of the direct to patient nutrition supply program for NSW Health program Enable NSW. If you are an allied health patient, you may not realise this is the reason they are calling. They call once a month to check what your order will be under the program.

The number they call on is a service centre, if you want to call back, you need to call the 1800 number on your invoice to place the order.

Caller: DHL

DHL calling on a delivery pickup

Caller: (02) 8310 4806

I have been getting calls grim them for months. When I answer quickly, they hang up. Otherwise they let it ring two or three times and hang up. Once I picked up the phone and didn't say anything and a very young voice said "hello?"

Voice Recognition Scam !!!

answered: no one on other end, hung up 3 seconds in

Caller: Scam

I called back the number. An automated voice says "You will enter an Echo test. Everything you say will be repeated back to you." I hung up then. Voice recognition scam. SCAM

Caller: Scam Call

“You’re about to participate in an echo test!” WTF?

Caller: DHL

This call is from DHL Supply Chain, they are on a phone system and as such you can't call them back on that number you have to dial the 1800 number

Voice said she was from DHL. I said I know nothing about that. She hung up.

I called back number (02) 8310 4806 rang once then gets disconnected automatically.

Received a call which went to messagebank and I could hear them hang up, no message left, my work phone number, on the Do Not Call Register.

I called back number (02) 8310 4806 rang 2 times then goes to busy tone.

I have received a few of calls from this number.
Each time when I try to return call -"Optus regrets that the number you called has been disconnected"???

I called back number (02) 8310 4806 rang 4 times then goes to busy tone.