Lodha Group — Complaint on not refunding cancelled units stamp duty amount

I had purchased a property of Lodha and cancelled the booking for which the stamp duty which I had paid was to be refunded by Lodha and it's been more than 1 and half year the amount if not refunded. I have shared several emails to service support team and also logged complaint on consumer forum but there is no action. Also, there is no response from Lodha customer service support team. My other friend with the similar case had received the refund of stamp duty and I am struggling. They don't respond and just keep giving you fake assurance. My money is still with Lodha.