July GST Returns Locked

Sir i have a query that i applied for gst number on 14 July but some how my number got delayed and due to which my gst number was issued me on 18 August due to which my gst july return is locked but i have issued bill to my credutirs of july on my arn number so what is the solution to this problem . Also since that day i asked for help at gst helpdesk but no reply from them and also from Gst Department.