File an FTC and CFPB compliant. Only regulators will light a fire. Experian isn't going to do anything due to consumer complaints, as the consumer's credit file is the product. Let someone from Compliance have to email the product owner about it, and the complaint starts the clock ticking.

https://reportfraud.ftc.gov/

https://www.consumerfinance.gov/complaint/

https://www.youtube.com/watch?v=9CWbc6pekd8&t=1310s ("We have a complaint database, we collect information, and are always eager for information" -- FTC Chair Lina Khan at Y Combinator)