No billing statement

Hey, I recently used runpod like two and a half months back and wanted to use it again. I had like 10 dollars in my account at the time and came back to see that it was empty now. I figured that this might be due to storage or some other network charges but I could not for the life of god find the distribution of how I was charged or anything in the the billing section for that matter. It's all empty. Can someone please tell me why this might be the case