Reliance Digital — Delivery and customer care

I have placed an order on reliance digital website. It has been more than 15 days i placed an order and i still dint receive it. The tracking details are not updated too. The customer service is really bad. They put calls on hold, convince us to call back and i never receive call backs. I have already paid for the product and it’s a huge amount. I don’t know how to resolve this issue.