No, you cannot return a COS (Cloud Object Storage) resource package. COS resource packages are non-refundable once purchased. This is because the resources have been allocated and prepared for your use, and the costs associated with this preparation are fixed.
For example, if you purchase a COS resource package that includes a certain amount of storage capacity and data transfer bandwidth, these resources are immediately available for your use. Even if you do not fully utilize these resources within the validity period of the package, you cannot request a refund.
It is recommended that you carefully evaluate your needs before purchasing a COS resource package to ensure that it meets your requirements. If you find that you need additional resources or have other questions about COS, you can contact Tencent Cloud customer service for advice and support.