Welcome to the community,
Could you please send me a PM (private message) with your CID (customer identication number) or your mobile phone number so can look at this service for you
The slowest NBN plan from TPG is so-called "12/1". The download speed is some amount less than 12Mbps down depending on time of day. Your upload speed is about right.
You should do the speed test again using the test on TPG's home page, using a computer cabled to router, or at least a wifi device next to router. Your result indicates multiple connections.