I'm from there at Puteri 10, so called 1st user from that area lulz.

@ mystiquemaya

Like I said, check your password again and make sure you follow the steps or just check back on the settings via the screen shots on the documents.

Also if possible do remove any existing currently connected PPPoE connection which is currently using your UniFi account. I don't think you can get connected with more then one connection at a time.

So sorry to miss out on that detail, in which I assume those router you are currently using has already been removed or somehow disconnected from the BTU already or via bridge to DIR-615 router.

Restart your PC and router and BTU then off you anti virus firewall and update then re run the speedtest then you 'll get yr actual speed

BTW: abnormal speedtest is due to packet loss.

Here Are Other Speedtest sites to check your actual speed: 
Jaring Data Center SpeedTest
Unifi Speedtest

If your speed still the same then it means they never cap you le