That's when it's time to sue.
https://en.wikipedia.org/wiki/AT%26T_Mobility_LLC_v._Concepc... (binding arbitration overrides state law)
https://www.nytimes.com/2018/05/21/business/supreme-court-up... (binding arbitration overrides workers' rights)
https://www.washingtonpost.com/business/supreme-court-backs-... (binding aribtration applies even in cases of fraud and deceptive advertising)
Unfortunately they have been successfully tested often in many legal systems.