[BUG] Billing: $200 promotional credit wiped after Max 20x subscription renewal

Bug Description

After renewing my Max 20x subscription, my previously claimed $200 promotional credit was wiped and the Current balance dropped to $0.00. The credit was not spent — Extra Usage was disabled at the time of renewal.

Timeline

1. Claimed the $200 one-time promotional credit successfully — balance showed $200
2. Renewed Max 20x subscription
3. Immediately after renewal, Current balance dropped from $200 → $0.00
4. Extra Usage was disabled throughout — the credit was never consumed by API calls

Expected Behavior

Existing credit balance should be preserved after subscription renewal.

Actual Behavior

Credit balance was wiped to $0.00 by the renewal process.

Account Info

• Plan: Max 20x (monthly)
• Promotional credit: $200 one-time credit (April 2026 promo, claim window Apr 3–17)
• Extra Usage: disabled at time of renewal

Screenshots

Current balance shows $0.00 after renewal, Extra Usage disabled, $0.00 spent.

Related Issues

This appears to be the same billing system bug documented in:

• #23674 — $50 credits disappeared after Claude Pro subscription renewal
• #25586 — $50 Opus 4.6 promotional credit disappeared after subscription renewal
• #32766 — $50 promotional credit disappeared after subscription change

Additional Context

Contacted support via help center. Received an automated (Fin AI) response that did not address the core issue and suggested re-claiming the credit, which is not possible as it was already claimed. Requested escalation to human agent.

This is time-sensitive: the April 2026 promotional credit window closes April 17, 2026.