Even when the laptop is turned off? Kevin
Hi mate, I have the same service and I have no issues. Agree that unless your neighbour has a dish pointed at your house and has busted any of your encryption, then it's not possible they are using it. You can test how far your signal goes by simply taking your phone/iPad for a walk and see where it drops out of wireless signal.
I worked for Telstra for years also. It is highly likely the problem is on your side, although not impossible.
change the password. Make sure your password is solid, or use the 15 alpha numerical key that is automatically generated.
Or, log in to your router and check what devices are connected. (do you have the Telstra router?) if you don't recognise any connected devices, disconnect them - you might see 'jimmys ipad' and then you'll know it's that jimmy bloke next door! In reality, it's probably your new fandangled fridge, air con, security system, baby monitor that is permanently connected.
By the way, if you do have a wifi camera change the pad for that also - someone could be turning it on remotely just for kicks and that could be using your bandwidth.
Then turn it off when you go out or away, and a couple of days later check your usage that day.
Not knowing your personal setup at home, there are many possibilities, but these should erase a few.
Mike