Consumer Protection Act Article 43

When a consumer dispute arises between consumers and traders relating to goods or services, consumers may file a complaint with the traders, consumer advocacy groups, or consumer service centers or their branch offices.Traders shall properly handle consumer complaints within 15 days.If the complaints referred to in the first paragraph has not been properly responded to, a further complaint with the consumer ombudsmen of the municipal governments or the county (city) governments can be made.
中文原文 消費者保護法第43條
消費者與企業經營者因商品或服務發生消費爭議時,消費者得向企業經營者、消費者保護團體或消費者服務中心或其分中心申訴。
企業經營者對於消費者之申訴,應於申訴之日起十五日內妥適處理之。
消費者依第一項申訴,未獲妥適處理時,得向直轄市、縣(市)政府消費者保護官申訴。

English translation for reference only; the Chinese text prevails. Not legal advice.