[Resolved]  Flipkart — I want invoice with my gst number added

I purchased a window air conditioners of blue star, on 28/4/2018, i received delivery on 29th, and got installed on 30th. But i didn't recieved invoice.in called up on flipkart and asked for invoice which they provided, but i wanted them to update my gst number which they are denaying, their seller partner has taken 4870/-rupess as igst, they are not updating nor they are providing their partner contacts. Please suggest me what to do?