My dental insurance tried to make me pay the full cost of my invisalign treatment twice. I've ignored the second bill. Delta Dental can eat shit and see how t

My dental insurance tried to make me pay the full cost of my invisalign treatment twice. I've ignored the second bill. Delta Dental can eat shit and see how they like their own insurance plans. They also dragged their feet paying the part they said they would cover. They split it into two equal payments and said I would get half now and half in the next calendar year as long as I had continuous coverage during that time. Checked EOBs/statements/etc for any hint that they could do this, it was the first time I'd heard about it.