After we checked the problem of W/B tape width 34mm with TFOC. They found crease on WB/tape length at 4000-5000 Km after that they can not use. They complained about your product and rejected this quality. We asked them to help using this lot. They help us to use it. However, they request you improve the quality of your product as urgent. They request you explain to them and apologize for this problem by email or letter. What should you do in the future if this happens again? Please write preventive action plan to prevent this problem.