Shiprocket — It's says product is delivered where as they have not delivered the shipment

AWB no:[protected]
I received a msg on 4th that my parcel from hyd-chennai has been delivered where as I have not received anything.
After complaining for good 10 days over emails and calls, they tell me it's lost and they will pay 500/- whereas shipment value is 1.1L worth of cloths.

The Ceo, founder, co founder are too busy to expand business and put ads but least care about the CUSTOMER service.

Shiprocket has no details about their shipping partner.:
1) amazon shipping address ( Hyderabad)
2 Amazon shipping address ( chennai )
3) courier guy who picked up the parcel from the warehouse.

What ### system they use, we have no idea.
They just have one simple answer that parcel is lost.

Now we are left with no option but to put legal notice against them.