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Other sellers or competitors may occasionally choose to engage in dishonest business practices in an effort to get an advantage over you.
Here are a few examples:
Infringements of copyright or trademark: Your private listing is being used by unlicensed resellers to make quick money.
Listing hijacking: A third party has taken control of your private listing and is profiting from your keywords.
If you see such activities on your listing you can report a seller to amazon through Get help>selling on amazon>other issues> listing abuse>report a violation
Here you can write in details about violation that occurred in your listing but before that you have to collect the data of a seller like
Product images
seller id
or other details which help your report or case.