After upgrading my internet connection from 512kb/s to 1.5Mb/s (and 14GB on-peek/month to 20GB on-peek/month), our download usage has gone through the roof. I have made special effort to be careful with downloads and to not download much, but our usage will just not go down. Before we would download approx 600 Mb per day, and it has skyrocketed to over 1 GB per day.
I contacted my ISP about this, and they said all they can do is to get one of their network technicians to look through our logs, and that would cost $88AUD per hour (which would be refunded if the fault was on their end), which I am not willing to pay.
What other options do I have? Being in Australia, are there any legal routes I can go down? Someone else cannot be using our Wi-Fi because not only is it secured, we live in the middle of nowhere and we would see someone if they were leeching off our connection.
I thought about updaters and game consoles running in the background, but with a new Macbook being the only addition to the hardware in our house (which replaced another computer), there would be no reason for our usage to skyrocket.