It is NAB giving you a heads up that you need to pay money off of a credit card or loan before you get an extra charge for not paying on time.

I called back number 0477 302 454 reached IVR for a company called NAB.

NAB automated call saying you owe money on a credit card. If you block the number they'll just use another one that starts with 0477

i have had the same number call me over the last three working days, claiming to be NAB bank. I have rang the NAB bank and they have stated it would not be them calling from a MB and they, it is a automatic message asking you to push 1 to comfirm it is you, them the next question is now please update you bank details.

it is another number from the natiomal australia bank

Have received 5 calls from this number so far in the last 24 hours, i haven't answered them. No message is left so i am figuring that its a telemarketer thought this is just an assumption at present

Started receiving calls from this phone around the same time I started receiving phantom calls from supposedly NAB 0477 302 301). Receiving one every few hours. So far, when I answer the phone I haven't heard anything on the other end.