Childbird kids couture - Product returned but refund not processed

I had ordered a green colour net frock from Childbird.in on **th April. I received a pink colour instead and the material of the dress was pathetic. Hence I contacted them through mail for a refund and after repeatedly mailing them they agreed for return on May *st. They failed to provide a existing contact number for communication. The number provided by them (**********) is always switched off. I returned the product to their warehouse on may *th at my own expenses. And provided them with the tracking id. Following which they told they would refund in **-** hours. I have been mailing them since then and haven’t received any response from their end.