2013 Scion FR-S engine problems

I took my car in for j02 engine valve spring safety recall on jan 29th, 2019 at a toyota dealership. Took them a couple days, but when they finished, they said the car was good as new and I could drive it normally. 2 weeks of daily commute to work with no issues, then on feb 17, 2019, I was driving up highway 1 for a couple hours, as I came around a turn, I was going about 25MPH, I tapped the brake to slow down as the road was sloping downhill with two hair pin turns up ahead.

One year after required j02 recall, I spun a rod bearing on cylinder 4. Car is well maintained and the oil level was full at time of failure. I was traveling at 70 miles per hour on the highway and the engine began to knock and died shortly after. Car stalled and would not restart, I had to coast to the shoulder and get towed. Toyota dealership that performed the recall is denying it had anything to do with the warranty and is requiring that I use an aftermarket warranty to get a used engine form another car.