Software programs commonly used by programmers are compilers, IDEs, and so forth. Questions about code using the GCP API are on-topic. However, your question is about your specific account and billing, which is not related to code or use of a programmer's tool, so it is off-topic. It also asks us how to contact that customer service, which is a request for an off-site resource. The
help center clearly states that customer service-related questions and questions asking us to recommend or find off-site resources are not acceptable. You may want to review those pages again. —
Ken White 1 min ago