It is CareerOne's marketing team. They call to see if they can talk you in to doing training courses. Some are free, most are co-pay. Either way, CareerOne make money off every person who signs up.

I called back number (03) 9892 7102 rang once then goes to busy tone.

this one rang me this morning .. i rang back with private number and got message with very rough sounding male voice saying all calls will be recorded. then nothing...