Help my R7800 nighthawk doesn't detect my internet connection

ok sorry to re-open this as I figured out what was going on so may someone someday find this useful 

will my NightHawk R7800 is working perfectly fine now.

Etisalat which is my isp automatically configures the router from their side with their ACS Server, even the WiFi. They can remotely update their firmware and manage your router without your agreement.
Etisalat will only provide PNP elife internet services from henceforth, you can't ask them to turn it off and use PPPOE username and password.
Any other third party router will not work, unless you connect it to the lan port of the Etisalat PNP router and turn off the WiFi in the Etisalat PNP router and use this router.

So, if you have issues, you will have to call Etisalat and buy their routers and range extenders and pay them technician visit charges and have to use their mediocre Dlink routers with the Etisalat logo.

Quote
"Etisalat provided you with the managed router (PNP) to ensure the service works correctly and allows 24 hours per day remote support, only with eLife in the UAE. If you would like to use your router, you can connect it as an access point"
Once again we are always here to serve and to support you, thank you for being our Etisalat valued customer"
in one email correspondence after I asked them if it possible to disable PNP and what are the benefits.
Made a phone call to 101 and asked other Etisalat technicians and they all said this is the newest thing henceforth and no other router works.

so i found this guy who came up with a solution to override all this scam but for his Asus router , what he did was:

( Before unplugging your dlink: Go into its settings -> WAN. Copy your username Copy your VLAN ID Copy your Clone MAC Address (This should be at the bottom) Log into your ASUS Router Select PPPoE Disable upnp. Write in your user/password At the bottom in special requirements from your ISP. Press MAC Clone button. The modem will fill in its MAC Address; change that to the values of the Clone MAC Address field you copied from your DLINK. Between every two characters you need to put : So for example lets say you copied 000000000000 In your ASUS it should be 00:00:00:00:00:00 Press Apply. Afterwards Click on LAN in your left panel -> IPTV -> Change the first field to Manual in the internet VID field write in the value you copied from the VLAN ID field from your DLINK. Press Apply That should do the trick.

and for real this did the trick for my R7800 except for some extra stuff in my router's screen like ticking ( use this interface ) in Internet setup.