They don't want to tell you, and shouldn't.

The reason they can't tell you is that you may then 'kidnap' yourself to collect on it.

By even "accidentally" disclosing it's exustence they would be giving the employee information that would help them to steal from the company, since their rates would increase after the fraud.

A more reasonable answer might be "We promise to do whatever we can to help any employees who find themselves in such a situation, but can't provide details as to the form that help might take as every situation is different."