Employment status not communicated

Hello sir/madam. I am Sudip. I am working in a reputed company of PAN India presence as a sales representative. I have completed three years in this company. At the time of joining we were ensured that after three years we will get our conformation as well as get a promotion. But now they are neither given any confirmation nor any replies to our mail. I have mailed the matter along with my colleagues having the same problem to our immediate superiors and the CHRD department addressing the HR. We were given increments in the past, having PF deduction but have never been provided the increment letter or the confirmation. From the beginning we are facing delay in our remuneration with the hope that after conformation we will eligible for higher pay and will manage somehow to the delay payment. But after serving three years of our asked probation they are verbally saying that either you continue a year more or search another job. I would like to bring in your notice that my boss given excuses that company is in loss and in no way they are likely to promote us. In the near past, Sales representatives of another state got their conformation and all conformed employees including those are in my office got a increment. It is true that company conditions are not so good but we are the only victims for this. Further having no work in the office, all the employee including us assigned personal work by our boss. My questions are: 1.Wheather we can complain to any legal body on confirmation if we will not get any replies after several mails ??? 2.If SR of another state got confirmed and we are not, this shows clear negligence and personal intension of our boss. How can we complaint this ??? 3.From the time of joining we are suffering from delay payments. For this suffered from bad loan repayment track, credit card payment default, rent not paid in time etc. Can we legally take any action for our sufferings? If yes, what are the rules, circumstances of complaints and expectations of such complaints.? Eagerly waiting for responses. Thank you.