Delete Account via SSH

I am useing Modernbill as my billing system for my hosting company and it also creates accounts via the modernbill. There was an error on my Modernbill and it seems to have create an account with an ip as .... somehow I am not sure how this could have happened. The server is saying it is created, but I can't see it on the List Accounts or Terminate Accounts List. I tried to create the account with the domain and it says it is already in use on the server. I am needing someone to go in via SSH and delete this account so I can create it on my server via WHM.