wrong declaration in e-way bill - Goods and Services Tax - GST

Dear Expert, One of my client has purchased a heavy machinery and send it to the location of the contractor from the place where he purchased the equipment and accordingly e-way has been generated from bihar to manipur but the seller of equipment has supplied only at Guwahati, further my client has arrange the transporter and further generate the e-way bill from Guwahati to manipur but in e-way bill he shows it as outward supplies and show the amount of machinery with gst tax. now, ASMT-10 has been issued in which it shows that outward supplies has different as compare to e-way bill vs GSTR-3B (Shows the rental income in GSTR-3B ) and tax has been charged on differential amount. further no reply has been given by the client to department and show cause notice has been issued by the department but again no reply has been given by the client to department. now, department has issued DRC-07 pls clarify