Verizon is stealing my router!

I switched to Fios years a go.  With that I was given a free router!  Nice deal, worked well.  Nothing on any of my past statements saying that the router was rented or that there was a discount being applied to make the router free.  Original deal was that the router was mine.

Now I have to renew my agreement.  This comes with a router that I can rent for $13/month.  It's the same exact router, part number and all, that I already have.  They won't remove it from the bill, so I'm paying for something I don't want or need.

But wait, there's more.  If I don't send back the router that I own, they are going to charge me $100 for it.  **bleep**!

How do I get this resolved?  I have tried talking and emailing to no effect.