Answer Paypal with:
Unlock our business account within 24h. Failure to comply will trigger Little Snitch firewall rule #X, completely blocking traffic to *.paypal.com on all X million devices.
I honestly believe this is not only a valid response but should occur anyway.
Paypal is a dumpster fire of scummy business tactics. Their emails don't even properly go through paypal.com and are filled with all kinds of phishy tactics.
Not a good idea to make andvance confession of intent to commit tortious interference against Paypal and anyone who didn't consent to Paypal being blocked.