[BUG] All extra usage money disappeared in account after renewing Claude Pro subscription using new card

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

I had 5 dollars in my account, along with 50 dollars of opus 4.6 campaign credits.
While it's acceptable for the 50 dollars to disappear, that 5 dollars shouldn't have disappeared.
Support has been ignoring me, saying my account isn't eligible for the campaign. I don't care about the campaign. Give me the credits (I fully paid for) back.

What Should Happen?

The money should've been restored to 5 or 53 dollars (2 dollars had been used from the 50 dollars credit)

Error Messages/Logs

Steps to Reproduce

Buy extra usage credits, unsubscribe, subscribe with a different credit card.
Your credits will be gone.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.63

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_