Snapmint — They are forcing me to pay the emi amount without delivering the product

I ordered a product worth Rs 499 from Amazon (through Snapmint app) and was asked to pay some amount of money as down payment, after I paid 75 Rs (as down payment) they said that they'll deliver the product to me.
It's been over two months, I haven't received the product yet and they're forcing me to pay the emi amount (212 x2) out of which I've paid one emi because they texted me (as sms) that they'll take action against me and send a person to my home address. I got frightened 😑 and paid one of the emi.
The company is neither responding to my mails nor my calls.
I don't know what to do now.
Now they're forcing me to pay another emi.
😭
Please help
Never buy anything from Snapmint
This is the worst, fraud app