This discussion clarifies whether the Reverse Charge Mechanism (RCM) is applicable to freight outward charges. It confirms that if you receive Goods Transport Agency (GTA) services, you are liable to pay GST under RCM. This involves creating a self-invoice and paying the GST accordingly.
In RCM regime the Receiver of the Goods or Services needs to pay Gst. As per your question you have received the GTA service thus you have to create Self Invoice & GST on the same.