what were terms of your appointment letter?
2) if your services have been terminated you would be entitled to salary in lieu of notice period
3) since you were working as head sales you do not fall within definition of workmen
4) A 'workman', as per the statute, is any person employed in an industry to do any manual, unskilled, skilled, technical, operational, clerical or supervisory work for hire or reward. The definition however excludes an employee employed in the managerial or administrative capacity; or in a supervisory capacity drawing wages exceeding INR 10,000 per month