Fedex — Complaint about a return packet from Germany to India

Few weeks ago a packet was sent from India to Germany through FedEx service. FedEx Germany returned the packet stating false information that "consignee refused shipment" and then after changing the statement that packet had returned because it contained butter which is also false. The packet didn't contain any such items. Now the packet is stuck at customs in Delhi and FedEx is not clearining because of missing KYC information. Why is KYC information of the sender required for a return packet when sender's information is already available with FedEx while sending the packet?
FedEx is also asking for Import/Export code, why is this code being asked for a return packet and for something not imported. Please take immediate action for the same.