I called back number (02) 4067 5092 reached voice mail but did not say for what company.

Seems a scam same message as when you receive calls from a similar number of (02) 4067 5049 & (02) 4067 5034. I rang them back and vm says cant take your call now we will endeavour to ring you back shortly. Between the three phone numbers they have rang me 5 times in the last week.