Is the air trapped in my new dental crown's socket and gum area due to poor margins or setting of crown?

New crown on #14 molar seems bulky, poorly fitted. Contact point btwn #14 and #15 is set back, with more of a gap facing the inside of my mouth Air trapped up in what I think is socket of crowned tooth. Dentist: "no such thing as an air pocket" & "everything looks good, nothing more we can do for you." A constant air pressure in this area. It is sometimes painful & affects my speech. Should I demand another new crown? or file a complaint or grievance and get it done by another dentist?