Bill collectors can be incredibly determined and bold in collecting an unpaid debt. They will often call one's place of employment.
Under the Fair Debt Collection Practices Act, a collector can not legally call your place of employment if you have told the collector orally or in writing that you are not allowed to get calls there. This is one of many illegal debt collection practices collectors try to engage in.
You do not have to put up with a debt collector calling you at work and the debt collector is also not allowed to tell third parties any details about the call. They can not tell your boss why they are calling, what you owe to whom or anything else with respect to a collection matter.
If you are forbidden from receiving personal calls in the workplace, the debt collector is required to stop calling there regardless of how you communicated this to him/her. Continued phone calls are a violation of the federal Fair Debt Collection Practices Act and will subject the collection agency to fines.
In recent years, debtors have gotten fed up with abusive debt collection practices and fought back with lawsuits. The courts have ruled favorably for debtors and collection agencies have been hammered with large financial judgments against them.
Therefore, if a collector continues to call you at work after being told not to you can seek an attorney, file a lawsuit and potentially collect a large money judgment against the collection agency.