Reliance Jio Infocomm — no refund for cancellation of jio phone

I prebooked the jio phone by paying the initial booking amount of rs.500.

After waiting for a few weeks i received an sms stating that the phone can be collected from the nearest jio store.

Upon inspection of the phone at the store, decided not to purchase it and cancel my prebooking order.

From that point things went south. Even after repeated requests they refuse to return the prebooking amount of rs.500 and when asked for the terms and conditions which state that the order cannot be cancelled, they refuse to supply the same.