Max Plan Gift Subscription Silently Downgraded to Free After 4 Days — Support Unresponsive for 8+ Days

What's Wrong?
Max Plan (x20) gift subscription was redeemed on April 5, 2026. The redemption page confirmed success, and the account showed Max plan for approximately 4 days. After that, the account was silently downgraded to Free with no notification, no refund to the gifter, and no explanation.
All 3 support tickets submitted have received only automated AI bot responses — no human agent has responded in 8+ days.
Support Ticket IDs:

215473780220048 (Apr 5)
215473833968703 (Apr 9)
215473835508297 (Apr 9)

This appears to be a systemic issue also reported in:

#1298 (anthropic-sdk-python): Gift subscription confirmed redeemed but account remained on Free
#41499: Stripe proration logic destroyed gift subscription value
#44163: Gifted Pro subscription auto-canceled without explanation

Steps to Reproduce

Gift subscription (Max Plan x20) purchased and redeemed on April 5, 2026
Redemption page confirmed success
Account showed Max Plan for ~4 days
Account silently downgraded to Free Plan with no notification
Submitted support ticket 215473780220048 on Apr 5 — received only AI bot response
Submitted tickets 215473833968703 and 215473835508297 on Apr 9 — received only AI bot responses
8+ days passed with no human agent response

Platform
Web (claude.ai)
Operating System
Windows
Additional Information
This is primarily a subscription/billing and support escalation issue, not a Claude Code CLI bug. However, it is filed here as this repo appears to be the most active channel for reaching the Anthropic team.
The gifter confirms no refund, no chargeback, and no cancellation was initiated. The downgrade was unilateral and unexplained.
Related GitHub issues confirming this is systemic:

anthropic-sdk-python #1298
claude-code #41499
claude-code #44163

Requesting: urgent human review and backend account restoration. Conversation ID 215473780220048.