>> I'm asking how they can keep calling when I'm on the do not call list. Apparently that list is useless  <<

Exactly how is the DNC list useless?

Legitimate telemarketers use it to prevent calls to registrants.  Just think - if there were no such list, you would be getting calls from BOTH legitimate and scam "telemarketers".

The DNC list is NOT a call blocker! If you thought it was, you are very much mistaken.

The DNC list does not apply to charities, political calls, surveys, debt collectors or companies with which you did business in the last 18 months.

The DNC list is ignored by spammers and scammers, and those criminals usually use VOIP or burner phones, and cannot be easily traced.  Kristi Thompson of the FCC explained that it can take her anywhere from five to ten subpoenas to trace a single robocall back to its origin

Is there ANY law that is 100% effective in preventing criminals from disobeying it?  If a criminal disobeys a law, is that law a joke?

The FTC penalizes organizations located in the USA that violate DNC provisions, but only if those organizations are identified!  Have you done your part to identify your callers?

The DNC organization does not sell its list to non-registered telemarketers.

All this information, and more, is available on the DNC site, for those who have the cerebral capacity to read and understand.  Apparently you do not qualify, but prefer to mislabel things that you do not understand.

If you want more protection than provided by the DNC list, get a call blocker app, device, or service, and learn how to use it correctly.  Try a little self-responsibility!