Thanks for answering, bro … yeah, I tried renaming the folders; it did nothing for me … I finally opened a ticket about it, but god knows when it will be answered … I wasted my entire Saturday trying to find a way to log in 
This is what I tried, but didn’t work:
1- Removed all addons
2- Renamed the Interface, WTF, and Catche folders
3- Restarted the computer
4- Restarted the router
5- Did a manual DNS flush
6- “Scan and Repair” through the game launcher
7- Completely deleted and reinstalled the game
If anyone has a different method, please do share so we can try it out
UPDATE!!!
I found a solution that worked!!
1- Go to your game folder > WTF > and open the Config.wtf file using a text editor
2- Manually write the following line at the very bottom of the file:
SET realmname “Normal”
and click save
If you are not on a Normal server, type PvP, Roleplay, or Hardcore instead …
Try it out and let me know! ^^