Power off the device or disconnect from internet and go to the server website and change that last few digts of the MAC address to some random digits and save as that, (digits can be, 0 thru 9 and/or A thru F)
Then perform an IPTV Reset there at the website and exit the site.
Then wait about 10 minutes.
Then go and replace your original MAC address and another reset and then do not connect your device just yet.
Wait about 10 minutes again.
Then power up and connect.
I did this and it worked right away but I have a reseller account .
I did the same thing what you did. But it didn't work for me.