National Congress of Employers - Health Insurance review: Denial of claim / no proof of coverage

Member ID [protected]
claim # [protected]
Plan # [protected]
I signed up for health insurance to be effective 12-1-15. In my package, I also received Dental coverage from NCE through Ameritas Life Ins. Corp. I submitted a claim (#[protected]) for service on 12-3-15 and it was paid on 12-29-15; no problem! I went back to my dentist on 6-8-16 and the claim was denied on 6-14-16 due to "service is after plan member terminated". When checking with Ameritas and NCE they are showing my plan effective and termination date to be the same! Obviously a mistake. I have spoken with no less than 8 people over the last 6 weeks, with a conference call between Ameritas and NCE, in which NCE assured me my plan was changed after the initial plan and was not updated with Ameritas. NCE said (twice) they were updating my file and sending to Ameritas. They also had my birthday wrong! I checked again on 7-19-16 and still nothing has been done. By the way, they are still deducting from my bank account! Meanwhile, I have a 30 year history with this same dental office and am looking at a $91 outstanding bill because of these incompetent customer service reps. Either apply my coverage and pay my claim or refund my premium. This customer service office is a joke! Here are a list of phone numbers I have called for 6 weeks: [protected], [protected], [protected]. Here are some names of the folks I have spoken with at both places:
Adam, Jackie, Becky, Bobbie and Vanessa (twice!)

Pam Stephens
3217 Red Bud Road NE
Calhoun, GA 30701