calls to join meeting

How do I stop the constant calls I get to come to a meeting?  Is there anyway to silence them?   I have tried blocking the specific person who makes them but they still come through.  I turn on DND but they still come through.... I am becoming severally annoyed with them to the point that I am about to cancel zoom all together and move to another service.  further more - is there a way to remove the "meet with video option from the zoom chat channels?  i do not want that option to be there at all.  To be clear - I am speaking of the chat channels and NOT the in meeting chat.