NHTSA Complaint #11580535 — 2016 KIA RIO

The HECu fuse recall has been over six months with no remedy. I called NHTSA two weeks ago and was told by a representative that the manufacturers (both Kia and Hyundai) stated that the remedy would be posted, and available at the dealerships by the end of last month (March). I would like to escalate my complaint. This is a serious safety concern, and on top of that my vehicle is now more likely to be stolen since it must be kept outside (Kia Boys). I'm a fairly patient person, but this has really gotten me sideways. If you could let me know how I can formally file a complaint I would appreciate it.