Please contact our after sales service department in time within 30 days after you receive the cargo.Tel:86-211-61172575  Time: 9:15 am.-6:15 pm.(Beijing time)ProcessPlease provide the copy of Sales Contract and describe the problem appeared.Problem ConfirmationSlight ProblemPlease send the proof to our After Sales Service department and  we will reply within two days.Serious ProblemAWe will dispach our Quality and Problems Appraisers to make a confirmation.BHave a nogotiation of the compensation and sign the agreement.COur After Sales Department will perform the duties as the agreement.