Locked out of my own listings? Legacy VC “Retail” contributions overriding Seller Central.

I’m fighting a ghost Vendor Central account for control over attributes for >400 ASINs.

• 2014: Created 400 original ASINs via Vendor Central.
• 2017: Migrated the brands to Seller Central.
• 2024: Amazon closed the inactive VC account.

Even though we are Brand Registered in SC, the attributes (titles, bullets, images) are locked to “Amazon Retail” contributions from the old VC days. Because Retail contributions have the highest “winning” priority in the Amazon catalog, my SC updates are ignored.

Support’s “Fix”: Standard Seller Support tells me to just keep submitting cases for every single attribute change. This is not a solution for 500+ SKUs that need optimization.

Has anyone successfully forced a Contribution Reset?

1. Has anyone found the right keyword or department (Internal Catalog Team?) to get legacy VC data disconnected?
2. Does anyone know if there is a specific Hard Refresh via Flat File that can break the tie if the VC account is officially deleted?
3. Is it possible to “re-claim” these through Brand Registry support by proving the VC account is defunct?

Any insights into how the internal catalog hierarchy handles closed VC accounts would be life-saving. Thanks!