Agents cheated on with 14 Lacs on the name of getting a business for the company

Hello,My company name is Exigent Tele- Services Solutions Pvt Ltd. We formed a company under partnership in 2017 in Kolkata and we contacted a consultant who pretended as outsourcing body of new business. The company name was Comcast infotech and the owner of this company is Rajdeep Ghosh who is from Kolkata. He work with few more people as a group in partnership and try to cheat people on money. Some of his group members are Tahzibul Islam,David,Sanjay,Bhaskar. They committed us for a Snapdeal business in the month of January,2017 and took almost 14 lacs in multiple instalment. Sometime in the name of agreement,Sometime as an commission to company people and once also to present a Bank Guarantee to Snapdeal. They did a initial agreement with our company which was only of 1.5 lacswhere we have his company stamp and his signature but later they always tried to take out money with some or other urjency. We trusted them and kept on giving money with the hope that they will get the business.But sooner we realized that there were few like Tahzibul,David and Sanjay and Rajdeep were all involved with lot of wrong practices and fraudulent activities.We realized that they were involved with fraudulent trading through tech support call center,then they were also involved with lot of money laundering activities during demonetization in Kolkata. Though we had nothing to do with their stuffs so that hardly bothered us and we are only worried of our money. We were more concerned of our hard earned money.Some of our partner has even taken loan to pay these bastards and till date we are paying our debtors. Though we did not have much documents on money transaction except the first agreement so we thought of taking out money on request rather than moving to court.But finally we realized that our money was gone and we couldnt get it back. But we have lot of evidence on whatsapp chat and as a recording file of the conversation on money transaction,and their commitment of returning the money back and much more. The main culprit to these frauds were Tahzibul,David,Sanja with a mastermind Rajdeep Ghosh. They are professional criminals in the society and have cheated so many people in the Kolkata market and still doing it. We want to know that can we take this matter to court on the ground of recording calls,Conversation of whatssapp and etc. Because these are the only evidence what we have to fight these criminals now.