I work in the HR department of a Limited Private company. Due to mental stress, I submitted my resignation in September 2012, but they didn't accept it. As per their request, I continued my duties until the first week of November. However, problems arose again, so I decided to walk out from the company by informing my head that I didn't wish to continue my service. I have now sent my resignation letter again through email, but they are saying that as I am a permanent employee, I have to give one month's notice period. I do not want to go back. Please advise on what I should do.