The DNC register doesn't apply to "surveys" and "research" calls, so it won't prevent these calls.
Try opting out at Reachtel's own website https://www.reachtel.com.au/do-not-call
You only have to enter your phone number (which they've clearly already got), and no other details are needed.
They say it'll stop the calls within 24 hours. We'll see :\

automated political survey

Automated call about a survey on Australian politics. Number is now on my call blocked list!

rings 3 times and hangs up. I've blocked this caller.

Caller: U comms

Nuisance calls every day even though blocked!!!

Called X3 times in last 20 minutes. I won't answer

Obscene waste of public funds by politicians, government and political parties doing surveys to bolster their own images and positions at our public expense. Frivolous frittering away of public funds that should be dramatically increasing the pitiful age pensions among other things.

Survey for election called two nights in a row at dinner time

Called right around dinner time. Didn't answer. But looks like others have had complaints too about this number.

Big scam!!

Caller: Spammers

Trying to get you to call back

They are pricks - don't answer, block the idiots!

Fed up with this number. Called many times within short time, during work and dinner time. Blocked the number!!!!

Persistent caller, Received call after 6 pm have not left message. Definitely not an urgent matter. Very annoying especially at work when in retail

Caller: Election polling

If they gotta ring to find out what everyone thinks we're all stuffed.

Caller: I Comms

Survey call hangs up when u answer always rings at dinner time how annoying!

no message left

Im on the do not call register and they keep calling my mobile which I find is extremely rude especially at dinner time. I don't care who they are they have no right calling anyone and hanging up.

Called and then hung up. Felt angry for the next hour because of this, they’re trying to push us all around something really needs to be done immediately

Pest call