Hey there,
As stated in the Read This Before Making A Support Topic, you can find the reason of your ban by logging into the dashboard, if it doesn't say your account is banned, something on your connection could be causing this issue.
• If you're using Proxy, try not to use it, and then test again.
• If you're trying to play at school/work or any public place, their connection could have been IP blocked already or be blocking the game on their network.
• If you're from UAE/China/North Korea or if your provider is blocking the game, you can use a VPN.
If you are indeed banned, please post an appeal in the Discipline Appeals section.
Let me know if this is your situation, have a great day!
Armin