Responsible Enterprise Regulated Recyclable Waste Management Regulations Article 14

If a responsible enterprise overpays cleaning, clearance, and disposal fees, it may apply to the central competent authority for refund. However, the total amount of the refund shall be limited to the total amount paid by the responsible enterprise.The refund in the foregoing paragraph shall be calculated on the basis of cleaning, clearance, and disposal fee rates corresponding to the dates on documents or sales invoices submitted pursuant to Articles 11 and foregoing articles. However, those enterprises that can prove the original deduction reporting and payment dates may have their fees calculated on the basis of the fee rate corresponding to the original reporting and payment dates.
中文原文 應回收廢棄物責任業者管理辦法第14條
責任業者溢繳之回收清除處理費,得向中央主管機關申請退費。
但退費總金額以責任業者已繳納之總金額為限。
前項退費,依第十一條及前條檢具文件或銷售發票所載日期對應之回收清除處理費費率計算之。
但可證明扣抵量之原申報、繳費日期者,以原申報、繳費日期所對應之費率計算之。

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