Is gst refund can be claimed on goods import

I have imported sanitary pads under HSN code 96190010 (Which is exempted under GST from July 2017) but while filling bill of entry at the port HSN code was wrongly typed to 96190090 (Which attracts 12% GST) Now, sanitary pads are exempted and we also purchased them under exempted code 96100010 but due to typo mistake we had paid GST which is a substantial amount, hence please guide Can I claim refund for IGST paid ? if yes please let me know its procedure.