Starbucks Tumbler Color Faded After Only 8 Months

I purchased a Starbucks tumbler approximately 7–8 months ago from the Starbucks location inside Acıbadem Eskişehir Hospital. From the very beginning, I only washed the tumbler carefully by hand, but over time, the entire color faded and the tumbler developed an unattractive purple and damaged appearance.

When I went to the Cassaba location regarding this issue, they considered the condition of the product to be the result of user error. However, I have never put the tumbler in a dishwasher. I have always washed it by hand and have not subjected it to any unusually harsh treatment or anything that could cause excessive wear. Despite this, the fact that the product faded and deteriorated so significantly in such a short period of time has seriously affected my confidence in both the product's quality and the brand.

I request that the product be evaluated as defective rather than being attributed to user error, that the tumbler be properly inspected, and that I be offered a replacement or refund. I also request that the inconvenience and loss I have experienced throughout this process be appropriately resolved.