GST Refund

Dear Sir/Madam,

            As we all know, payment received via export of goods/service will not attract GST (zero rated category). But, payment received for the export was wrongly added with the payment received for domestic transaction. And the calculated GST amount had been paid (GST paid for the payment received for export - the zero rated one). Now, can we get back the amount we wrongly paid? (Calculation and payment was made in the previous FY).... If we can get refund, what is the procedure?