What should I do if the used car collection of melon seeds is very violent?

Save the evidence and call the police.

1. Keep evidence: Keep all communication records, short messages and emails related to the collection, including telephone recordings and short message screenshots, which can be used as important evidence for your subsequent handling of this matter.

2. Alarm handling: If the behavior of the collector has been involved in illegal crimes, you can report the case to the local public security organ and provide relevant evidence for its investigation and handling.