Billing of gst on export freight

Hi All,

My company is a freight forwarding company. My company charges GST to its overseas agent for export freight shipments services since it is paying and taking input of GST for charges by liners and GTA. Now the issue is that overseas agent does not pay the GST as it is an extra cost for them and hence my company needs to pay GST to the department and then claim the refund. Is there any provision where I need not charge GST to the oversees agent and i can take the refund of the input credit unutilised on the transaction ? 

Thanks in advance.