Tragic news

i inform to icai that ca firm kolkata want to be off me from articleship.as i am not pass intermediate(ipc)exam & my articleship period is remained 1.5 yrs.firm says that i am a dull headed & work done by me is too much error.but there is no scope for identify the error where i am doing error.but if i identify any error of them they say that is not their mistake. is it possible or not?