Who is the owner?

Keep calling

They keep calling everyday

Keep calling asking for Jennifer. Told them a million times there is no Jennifer at this number and the do not call list is worthless.

If they are not selling something, then they are not required to abide by the DNC.  You obviously didn't read and comprehend what it covers.  Here, maybe you should go learn something:  What the Do Not Call lists covers and doesn’t cover and why:  https://www.consumer.ftc.gov/articles/0108-national-do-not-call-registry