Spice Jet Airlines — Unethical Behavior from SpiceJet, Refund Required

I was supposed to be flying out from Dubai to Mumbai on the 18th of December. My flight was initially booked for the 13th of December, however on the 11th of December I made the change in my flight ticket on the Spice Jet website to fly on the 18th of December. I have a credit card charge to confirm this change as well. I checked on the Spice Jet website on the 17th and it said that the flight is on the 13th of December, however I had already PAID for a change in this flight.
I had to be in Mumbai for some important family issues and the only thing the agents kept telling me was that there's nothing they could do. When I asked for a manager or supervisor they had every excuse available, from no supervisor would be able to help me, to there's no one in the office, to anything they could to keep me from getting on the phone with some sort of manager or supervisor or anyone. I had to buy another ticket last minute and spend a lot of money on a flight.
When I initially called Spice Jet and spoke to the customer care executive, she said all I would have to do is write an email and you would refund me the money right away. I have been calling Spice Jet almost every single day and all I have been hearing is that it is coming, then someone said that Spice Jet has issued a refund but they can't tell me the amount, then someone else said that they assured me in 24 hours I would get a response to my email saying that I would get a refund but then when I called back they said oh no wait for 72 hours. Every single time I waited, I never got a single response. I have had to call back and explain the situation EVERY single time. They have consistently refused to give any sort of solution to this issue. They've been giving me the run around for 2 months now, and I still haven't gotten anything.
This is the first time I flew with Spice Jet but I can say with conviction I will NEVER work with Spice Jet again.
There was not even any communication from Spice Jet regarding this supposed no-show. If someone had contacted me, even sent me an email about this, then at least I would have 5 days to get some sort of solution before I had to fly.
At this point, I just want a refund from SpiceJet so that I can finally stop dealing with them.