Firstly with all the due respect i advice you not to use CA prefix before your name. It's totally unprofessional. First earn this degree then use these words. If you can't abide by the ethics and regulations of any profession then there is no sense in pursuing such a honourable profession. I am sorry don't take it personal but it felt very bad to me and the way you replied Mr.Naveen when he raised objection on the same issue was pathetic but even then he replied to your query with all patience and cool just like a professional should have. You said that using the prefix CA is beneficial to you ,despite knowing the fact that you are not CA let me tell you this is misrepresentation to the public at large and is wrong in eyes of law too. There are many students who are trying day in and out to earn this prefix because this is what their life's aim. If they also start writing CA before their name like as you have done then what message will go to public? Everybody will lose their faith in this reputed profession and this might be the death of CA profession. So, kindly remove it. If you want to add CA to your name then earn it by passing all exams, trainings.
Thanks...