Mango Airlines no response on refund due

I booked a flight on 3 September and made payment by EFT. The payment went through. At the last step on the website a message came up telling me something went wrong and diverted me back to the homepage. I called the call center to explain and they informed me that there is no booking in my name. I was told that I will receive my money back in 48 hours. I have send an email in this regard and got no response. It is useless to call the call center as I have been holding on for more than 30 minutes today with no answer.