UPDATE

My 8Mbit had been activated
Thanks to the technician aka engineer

Connection Status  Connected
UL Rate (Kbps)  636
DL Rate (Kbps)  10235
UL SNR  21
DL SNR  26
Trained Modulation    ADSL2Plus
LOS Errors  0
DL Line Attenuation  6
UL Line Attenuation  3

It doesn't matter, although 10Mbit port my max speed is 9Mb

As long you get 8Mb on actual speed test you are okay

Note : You got better ADSL quality than me

Best effort policy applies
As long as 80% then you cannot complaint
Try yourself I can say

That make sense due to line cap to 8191kbps.
Given the theoretical case where everyone in Malaysia has no internet, and you are the only one connecting to Streamyx, the maximum speed you can achieve is 87.3% of 8191kbps. This is due to the ADSL overhead.[Source]

Talk to your installer again and see whether he can help you.

Otherwise, you will need to call 100, and complain to ask them to change the sync rate to at least 9400kbps for you to achieve 8Mbps speed at the very best effort that TM can give. That takes a lot of phone calls and probably longer waiting time. YMMV.