Have already blocked, although manages to still get through to voice mail. No messages left, just background noise. The 4th person calling from either 0415 154 or 0415 158 numbers so presume it's spam/telemarketers.

spam call blocked number

I called back number 0415 158 462 reached voice mail but did not say for what company.

Spam, block number

I've had 2 calls in the past 2 days from 0415 158 462 and 0415 154 214 (both unknown, but same prefixes as "Jane Doe" commented on). No voicemail left. I haven't called back