If a private Airport executive can use physical obstruction to get money out of another party does that mean Telstra can block you in your driveway if you’re late on your bill?
You are not on Telstra property though. Telstra can and will quite legally cut off your use of their service, even with your own device, until you pay. If you eat in a cafe, then try to leave without paying, and the owner locks the doors to prevent you from leaving until you do, is that legal? Or morally right?