1. Collect evidence: Make sure that you have relevant evidence to support your complaint, such as traffic violation records, transaction records, charging documents, etc.
2. Contact the ETC operator: Find the operator of the ETC system you are using, and you can find their contact information on the relevant official website, customer service hotline or mobile phone application.
3. Submit a complaint: submit your situation and relevant evidence to the ETC operator. It is best to submit a complaint in writing and keep a copy for later use. If you have photos or other supporting materials, please also provide them.
4. Follow up the complaint: Wait for the operator's reply, usually they will reply to your complaint within a certain period of time. If the waiting time is too long or you are not satisfied with the operator's reply, you can follow up the inquiry or seek other solutions.
5. Help: If you can't reach a solution with ETC operators or are not satisfied with their answers, you can also report your problems to relevant regulatory authorities or consumer rights organizations for help. They may provide further guidance and support.
Please note that the above steps are for reference only, and the specific complaint process may vary by region, operator and specific situation. It is recommended that you read the relevant ETC contract terms and use policies before you complain, so as to understand the relevant complaint procedures and rights protection.