Byju's — Refund of course

I had registered on byjus app. After that they start calling me about my preperation. Then they told me they give free counselling but in the counseling they forced to register the course. I paid 7000₹. But after that i searched on YouTube is that course good, i came to know that it is a scam. They i called for i didn't want to register. But they forced and called me again and again. Just see the course content. Then I did full process. After that i put a mail within period of cancellation. But now they blocked me and didn't responding me. I tried daily on helpline number but they are just student. They can't tell anything.
Now it is totally a scam. Also my 1st EMI deducted from my account.
I belong to a poor family.
Please help me.