Refund on GST Export

yes if you have charged IGST on the tax invoice 

Only exports will lower drawback claim are eligible for refund. Exports both LUT or IGST paid are eligible for refund subject to procedural compliances on the procurement side. In case of an error by oversight for mentioning higher DBK instead of lower DBK in shipping bill resulting in rejection of proportionate GST refund, you might have to appeal.