called 830pm central time.. i didnt answer it

I received 3 phones today alone from this number. They call me daily telling me it is MBO Research company and wanting me to answer some questions.. NOT going to happen.. I have reported them to do not call registry (which in itself is a joke).. Asking them to take my name off the list and please not to call only seems to make them call more!
I have a 90 year old bedridden parent that is constantly disturbed by these more than annoying calls!
We can send a man to the moon but can't stop the research calls? Unbelievable.