Welcome to TPG Community!
I've searched for your account using your Community details and was able to find a match.
I've completed a line test which has detected a high download traffic which would cause the slow speed connection.
If you have multiple devices, you can try to leave one device connected to the internet one at a time until you figure out which device is causing the download traffic.
Also please check if you have any application running / downloading in the background.
Let us know should you need further assistance.
... View more