A few general notes, and this is not legal advice, just background. PayPal is a private company, not a bank, so the account relationship is governed mostly by their User Agreement rather than by the deposit protections people assume. That agreement generally lets them limit accounts and hold funds when they perceive risk, and it usually contains an arbitration clause and a class action waiver.
The CFPB complaint route works because PayPal is a regulated payment processor and is generally expected to respond to complaints routed through that channel, not because it changes your contract rights. If real money is stuck and the documentation route stalls, talking to an attorney licensed in your state about your specific facts is the right move. Whether claims like unfair business practices or breach apply is very fact specific and varies by jurisdiction.
I'd avoid leaning on any one statute as a magic word. What actually moves these is clean proof of a legitimate completed sale plus persistence.