NHTSA Complaint #11618625 — 2017 HYUNDAI SONATA

Bought a car. In couple days check engine light came on, it was blinking and car was put on limp mode, rpm between 1800-2000, speed 60-62 mph. Went to dealership they did full diagnostics, told that they are going to submit to Hyundai to replace engine at their cost. Hyundai came back that they want to replace knock sensor and then see what’s gonna happen. I replaced and was told that i have to pay even though there is a recall on Knock sensors. They replaced the sensor which was over 600$. And the problem came back in less than 36 hours. Now the vehichle is back again at the dealership and they gonna do diagnostics again. Which is ~200$. I need to help this resolved as i’m only being ripped off with no solution. The vin says it doesn’t have any recalls, but vehichle is experiencing exactly what’s on recall. The vehicle has been in the shops for a month now. Thank you