Reliance Digital - Refund not received

I placed an order from Reliance Digital of a One plus **r brand smartphone of Rs. ***** on *th August **** and my order was confirmed and a tracking id was shared but when I was tracking the order I was not able to track and when I contacted them they told that it will be delivered to you but never got delivered. On *th August they sent a mail that the order is initiated for return and will get the refund within * working days. I did not receive the refund in * days and when I contacted them they told that the refund was initiated on *th August and it will take */** working days. I again waited for ** working days but still no refund and now whenever I contact them or mail them they just keep asking to give more time or their team will contact in ** hrs but no resolution yet.