Defective Volume Mismatch in My Shiseido Bio-Performance Serum Set

I purchased the Shiseido Bio-Performance Night and Day Serum set from the Shiseido counter inside the Panora Mall Boyner store. The product consists of two separate serums—one for daytime use and one for night—and by design, both serums are meant to be used simultaneously to complement each other.

Throughout my routine, I applied the day and night serums regularly, carefully, and in equal amounts as instructed by the sales representative. Despite this, the day serum ran out significantly faster than the night serum. Because I did not want to interrupt my treatment, I had to open a second set just to use its day serum, leaving me forced to cross-use the products. At this point, my day serums are completely empty while my night serum remains almost full. I am certain this uneven depletion is not due to user error, but rather points to an inconsistency in the filling volume or formula dispensing of the products.

Although the sales assistant who helped me during purchase was attentive and advised me to keep using the set this way to avoid breaking the routine, this situation continues to cause a genuine inconvenience. For a paired set used in equal amounts to deplete so unevenly goes against both the product’s core promise and its intended usage logic.

I demand that this issue be resolved by providing me with a replacement day serum, and I request a thorough review into this volume mismatch within the product set.