Delhivery — Shipment Misplaced and no Support or contact person to track thereafter

Placed a order to be picked up from home with the clear mention of AWB number on it . The product that reached destination was a wrong package and we declined to accept it . When contacted with the Pickup person, he said package is misplaced and therafter stopped picking the phone .
Opened a ticket with Delhivery but they only send autogenerated mails . Neither anyone of the team has reverted with the resolution .
It has been more than 11 days and the important package remains misplaced with no resolution in foresight