or Inferior Quality （由于质量低劣而抱怨）
With reference to our Order No. 315, we are compelled to express our strong complaints for the inferior quality. Compared to the sample No. 169, the arrived self-adhesive correction tape is very transparent and does not satisfactorily cover the error being corrected.
We shall be glad to have your explanation of this inferiority in the quality, and also to know what you purpose to do in this matter.