the guy on the phone with this number (07) 3465 3171 said he's calling from Clever Contacts

Been receiving unsolicited calls from a series of closely related numbers, no message, I haven't picked up.
They have the form (07) 3465 31xx
So far, (07) 3465 3164, 3169, 3171, 3172
My guess is that they are trying to get around their number being blocked.

Didn't answer it, no message left. Presume to be a nuisance call.

Not a genuine caller. Called yesterday by (07) 3465 3169, only two numbers apart

Caller: Clever Contacts

Rang back to a VM for Clever Contacts, caller did not leave message. Sounds like a call center

no information on record about this number, I assume it's canvassing