巴西采购需求：中国物流公司，中国仓储服务，食品出口，服装出口，医疗器械出口，中国清关

We're facing issues with unauthorized importation of our client's trademarked products from China to Brazil, despite having registered the trademark and customs record a year ago. Competitors seem to bypass customs controls, and we need insights on potential reasons for this. Could your firm assist us in navigating customs enforcement in China? Specifically, we're looking for guidance on procedures to block these exports and any related costs. Also, any experience you have with similar cases would be valuable.