Flipkart — Pay later option unavailable without any reason and no response from anyone

I had ordered a laptop through pay later emi option through Flipkart. I don't know why they cancelled my order after my amount debited. They refunded the amount but why did they cancelled my order?? Then I had tried to order a same product again but the pay later option was unavailable after that issue. I don't know why its happened. I called 50+ calls to Flipkart customer support but they don't know to how to resolve the issue they simply said wait for 2 days and wait for 5 days. And after that one guys sent a mail and I replied to the person about my issue but after that no response from that guy. One girl called me and asked my issue but she said different answers like remove my cart item and try to order or uninstall the app and try to order I don't know what is the difference between cart and pay later option and I even tried that thing but nothing happened pay later option is still unavailable. Totally worst experience ever in Flipkart. They don't know resolve a problem atleast they should have responded for my message. All executive are simply telling to wait they don't know how to resolve a problem. They just try to move the issue to other person. No one will respond if you have any problem. Totally worst experience. I contacted even IDFC Bank and they said the issue is with Flipkart only. But I don't know how to contact the person to resolve this issue. I sent a mail and messages to many persons but no one responded me till now the sales will end.