Health Insurance not fighting dentist collections

I am in communications with anthem blue cross blue shield about a wisdom teeth surgery from over a year ago. The dentist office made a claim with my dental insurance but dental insurance isn't paying until they get an eob from health insurance. Health insurance won't send eob because the dentist made no claim with them (wtf??). So it's obviously the dentists fault for not timely filing and now they're trying to send me to collections. I asked a anthem rep to send them a cease and desist letter per their contract of timely filing but they said "if we had a claim number or an attempt of a claim we could do that" the problem is the dentist won't submit the dang claim and they're a participating provider with the dentist! Idk what to do from here cause they told me all this like 14 months after the surgery