I play online games every weekend,and the upload speed is keeping slow or 0 mb
I already is 1gb fibre package a month and your promotion said that will not affect the download and upload speed!
Seeing 0 in the upstream could be a service fault. But how that 0 is measured matters greatly.
Check for a local service fault via 0800 561 0061 - it is an automated service.
Check the speed at the Hub / Device with ...
Once the test begins click on: Run full test to see the Upload stats.
Do share the screen shot of the results.