[BUG] Billing: $100 Max 5x gift card credit disappeared — no support response after 3 tickets

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 redeemed a Max 5x gift card while my subscription had an overdue invoice. The $100 credit appeared on my Billing page but was never applied to subscription renewal. I paid $80 by card to clear the invoice. The credit then disappeared completely.

Three support tickets submitted — none received a human response:

• Conversation ID: 215473790959444
• Conversation ID: 215473835489747
• Conversation ID: 215473919891596

What Should Happen?

Max 5x gift card should extend subscription by one month as documented. The $100 credit should not disappear without being applied.

Error Messages/Logs

No error messages. Credit silently disappeared from Billing page

Steps to Reproduce

1. Have an active Max 5x subscription
2. Miss a renewal payment (overdue invoice)
3. Redeem a Max 5x gift card
4. Observe: credit appears on Billing page but does not apply to the overdue invoice
5. Pay overdue invoice by card ($80)
6. Credit disappears from account

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

N/A — this is a claude.ai billing issue, not Claude Code

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Windows Terminal

Additional Information

Expected behavior:
Max 5x gift should extend subscription by one month, as documented.

Actual behavior:
Credit appeared briefly, was not applied, and disappeared.

Account: artem.kruchinin@gmail.com's Organization (Max 5x plan)

Related issues: #45681, #41499, #45335, #47290