I would suggest do not post your details on all sites especially with your employee code. This would be inviting further trouble than you are already facing. I have been in a similar situation before and yes, life can be made far worse.
A. Your company is a commodity trading firm and it has some complaints from clients (https://www.consumercomplaints.in/bycompany/goodwill-commodities-a330561.html). It is a five-year-old company with three directors and sounds like a family run company with a paid-up capital of Rs 85,00,000 (https://www.zaubacorp.com/company/Goodwill-Comtrades-Private-Limited/U67190TN2013PTC090365). Taking on people in the trading industry is not easy, for instance, you can have a false case filed for data theft or money misuse etc.
B. First, do not escalate the situation. Broker a peace and stay neutral. Continue in your job, the title of regional head etc does not matter much in a small company. The job market is saturated and it would difficult to get a job quickly. If you are confident of getting a job then start working on it and then we can tackle the current issues once you have a job offer in hand. Often there would be unofficial mediators would settle such issues for a percentage of the amount recovered. Although it wouldn't be in black and white, this options helps both sides to move on if they have already reached a stalemate.
C. Try to find out if there are other employees in your situation. If yes, how are they handling it? Whatever clause is there or not in the contract, it doesn't matter much because each of the contracts, will have a clause along the lines of ' the terms would change or be modified from time to time at the discretion of the management. See how much is your loss and how you can salvage the situation. Often running a protracted legal battle even if you have all the facts in hand is not an easy task for the common man. You need money, infinite patience and plenty of moral support because ultimately the firms often win. For one employee who wins against large firms, there would many others who have wasted plenty of time, resources in futile efforts.
D. Once you defuse and change your approach, they would change their stance, you may find that business is dull, the margins are less, the firm has huge overheads etc. While you maintain a low, non-threat profile at work, gather as much evidence as possible right from the interview to date about official correspondences, emails, HR letters, how much salary people in similar positions are getting, bank transfers etc in chronological orders. Important phone calls with date and time with the discussion points would also help you in the future.
E. Here you should play by the game of minds subtly and with due attention so that you can get the settlement done in a favourable manner; even if you fail, you should have enough evidence to go down the legal route. Quitely stay on the lookout for a new job and shift base. This experience would be a lesson to remember for the future.
F. If you have the resources and want to fight it out, then enquire from a couple of good lawyers from your friends and think it out clearly. What are the estimated legal expenses vs what is actually due to you? In general, terms seeking legal help implies that you have exhausted all negotiations and reasoning with your employer and it's a big step forward. First, is to have a neat letter with the dues pending sent to the HR via registered post with acknowledgement due and certificate of posting. After a month if you do not get a reply, then send a reminder. You have to pursue with the HR and management persistently to get a reply.
G. Under the Payment of Wages Act 1936, section 4 states that the wage period shall not exceed one month. If you do not get a favourable response, you need to approach the Labour Commissioner. The names of the various Commissioner of Labour for your area would be in this link(https://mahakamgar.maharashtra.gov.in/lc-contact-us.htm)
The address is
Mumbai-Pune Road, Bangla no.5,
Shivaji Nagar, Pune - 411005
Tel No. 020 - 25541613 / 25541619.
Fax No. 020 - 25541619.
H. If you still do not get answers you can file a case for recovery of dues under the Section 33(C) of the 1947 Industrial Dispute Act. This is often done in the Labour courts and the settlement would be reached in around 3 months. If you have evidence that you have been a victim of fraud practices by the firm, then you can think about the Employer fraud option under the Companies Act 2013, section 447.
I. Lastly, think about what contact you have among friends and colleagues and to what extent they can help you, at times firms can be very intimidating and is it worth taking all the risks on yourself and your family. Or it is just safer to move on and still able to work, this unpleasant experience will always help you in future jobs.