1. Log in to etc official website and check the existing offers in the user center or the preferential information page.
2. If you need to inquire about the historical discount, you can log in to the etc account and inquire about the recent payment records or discount coupons to find out whether you enjoy the 8.8% discount.
3. If the actual toll is inconsistent with the estimated toll, you can inquire about the specific payment record in the etc customer service center or contact customer service for consultation, investigation and solution.
Etc is an electronic charging method. At present, some expressways will implement a 9.8% discount policy for etc users.