Transmission Slip Out Of Gear problems of the 2016 Mazda MAZDA3

My car twice in one day shifted out of gear and became unresponsive when I tried to use the accelerator. I was on a surface street making a u turn the first time, and had made a right turn the second time. I took it to my mechanic after the first time it happened. He told me it was the module in my automatic transmission that was sending a faulty signal. There is a recall for other 2016 Mazda 3 vehicles for this problem, but my VIN isn't included, so a Mazda dealer I called refused to fix it unless I paid for it.