Physicswallah app - Refund is not given when delivery is denyed

I want to cancel my order and want refund for it. Message came that books will arrive on * May so it's better you should not print it. I ordered it for someone but he already joined a coaching institute. So I want a refund.
Ps:- you haven't replied to my email. If this will go on I will take strict action towards it because this is not good that you are treating us like this.
This is the conversation of mail which they haven't replied yet.
Then after this I mailed them this.
This is link of the website which shows what to do if a company is ignoring your messages and not giving refund of a unused item
https://www.quora.com/How-do-you-handle-a-company-refusing-or-ignoring-a-refund-request-within-the-refund-period


This is screenshot of a chat where your messages are unseen and has been not responded

This is the link of your video where you've talked about that refund will not be given.
https://youtu.be/RpWvLa*f*yw

I know you'r team was unwell that's why I was waiting but not it is a high time my uncle is a lawyer and I think it is time for a legal action in court. Don't think it is just ****/- Rs because money is money and you guys are doing cheating which will not be tolerated. I have all the evidences and my side of case is strong. So let's meet in court and I am doing online complaint too in Voxya site.

Don't think to ignore my mails this time because in *-* days a court order will come to you so let's wait and watch.
They haven't replied.