Flipkart — Fraud of money with my purchase of Air conditioner with order id OD[protected]

I placed an order on 14th May 2023 of amount of 31999. Copper pipe was missing in the unit and after consulting flipkart customer service they advised me to tell the haier installation person to fit the pipe on my expenses and the amount will be refunded. They charges me 3000 for the pipe and afterwards flipkart only agrees to refund me of 1800 only in flipkart wallet. My complaint is how can they force me the refund only in flipkart wallet. As I have paid in cash additionally so they would have refund in my provided bank account. I was in so need of cash then. This is unethical business practice.