if your whats app number has been banned from using what's app service, please make sure to follow the below steps:
1- Make sure to download the whats app from a trusted location "google play for android or Istore or from whats app official website".
2- do not add people to groups without their permission.
3- do not send messages to people you do not know add n a mutual groups.
4- follow terms and services for whats app.
5- if you still can not use your account please press support on the login page
6-describe your problem and if there is any mistake you made unintentionally apologize for it and that's will help alot.