I did some digging and ACT seems to be using CTS SWH-3109 switch for shared connections and CTS Acton-1000(can't find the specs for that one anywhere) - something like the HET-3012-DR for home giga connections.
Plan changed but the wiring change hasn't happened yet.
I have it connected to an Ubiquiti Edgerouter X - but connecting the ethernet directly doesn't make a difference. Download jumps from 400 to 600 ~ probably means download congestion I guess from the switch I'm connected to.
My installation ticket is still pending with ACT; even though the plan has been changed, fees have been paid (including installation!), etc. I will try to escalate and try to get the dates extended. When you think about it, I got the plan in the middle of the month (but I will have to renew again next month beginning as usual). They assume this $ covers this whole remaining month only but I paid for the full month. That's BS.
Anyway, here are some speedtest results. My area has a power cut (and when I took the tests) so you can subtract a little bit on the Download side considering I'm still in a shared switch.
Chennai : (ACT / Airtel servers)
Singapore : (Singtel / Viewqwest servers)
Frankfurt : (LeaseWeb / DEAC servers)
All tests taken at 7PM, local area without power. (not whole Chennai, so congestion wise I still get decent speeds elsewhere).