Flipkart - Online payment fraud unethical behaviour of customer service team

I had ordered a prologue shoe from Flipkart which on **/**/**** was going to deliver on my address. As usual, I got the link of Ekart to make payment through phone pay. Firstly made the payment through phone pay because of some unknown issue. I didn't get the * digit key which I should receive through SMS on my registered mobile number. The delivery boy told me that "this is a common issue you can make payment through cash on delivery after that your money deducted will be refunded to your account".
I was waiting for the key but after some time since the delivery boy was not willing to give the product without that key and I want the product that day. I made another payment through my debit card and got the product. But the most interesting part starts now I am trying to call customer service of Flipkart to solve my issue they are acting as dead from **/**/****. I called them more than ** times every time on executive say that consulting team will contact you within ** hours.
Once they called too but that too makes no sense when I sent them all the transaction made by me to them via mail. Since then they are totally neglecting the issue. No one gets in touch me even after calling many times. The best part comes today when I tried to call them. They just hold my call and the call got disconnected after ** minutes of hold.