Damn.
The reason I mentioned your employer's HR is strength in numbers. Do you work for a public school? If so, you're probably part of the same employer group as the city, county, etc. That's a lot of customers. If that employer group approaches BCBS and says, "Our employees are dissatisfied with the cost and quality of your product, and we're looking for a new insurance partner" it might get their attention. Obviously it would take several complaints to get there, but you're probably not the only one having this problem.
Good luck to you. I hope you get some relief.