Ventet Educare - Stipend not given yet also refund money to the customers not given yet

I have applied for Business Development internship for a month duration in Ventet Educare through internshala. Throughout the month of internship, I got calls and messages every day asking for the status of work and it went well as they have received customers through us.
So basically this company hired me as a business development intern for a month and once the internship got over they stopped receiving my calls, rarely responded to my messages and emails saying they will get back with the updates and they were doing this for past two months. I still haven't received my stipend yet. I have called them n number of times mailed them many times. But they are not sending my certificate and stipend of Rs. ***** as mentioned. Also, they said that they are selling t-shirts of Rs. *** where half the money goes to the NGO and half of it to the organization. So we had to get the customers. Around * people have purchased from my side before two months. Even they didn't receive the t-shirt yet. When asked about that they kept giving random dates for delivery but none got their t-shirt worth Rs. *** to * people and Rs. *** to one person alone. Please kindly look into it and help me out.
The CEO gives false statements and excuses daily. Gives random deadlines and avoid calls when the deadline arrives.