Perhaps you could investigate how the Parrots got hold of our mobile numbers in the first place? I know that’s not your job but it seems the MSM aren’t interested in being investigative journalists. (My suspicion is it was the telcos.)
Theres no clear answer but SBS suggests marketing agencies who data mine from online databases, or random number generators. (It wouldn't surprise me if Telcos are involved)
Comments
I'm more concerned about the Telco's allowing the messages to be sent from undisclosed, unblockable numbers.
https://www.sbs.com.au/news/article/trumpet-of-patriots-texts/vsqj4l75x
Most media outlets have covered the topic.