Automatic Transmission problems of the 2021 Kia Motor Telluride

I drove my brand new Telluride off the lot with approximately 12 miles on it. About a month after having it I noticed the following: when entering a highway from about 20-25 mph, the vehicle would not gradually accelerate allowing me to enter the highway. As I continue to press the accelerator pedal the rpms would eventually jump up and the vehicle would launch itself forward. Reaching 5000-6000 rpms. When I let off the accelerator the engine would downshift similar to a manual transmission and would jerk as it changed gears and the rpms decrease. Additionally, when creeping in traffic I notice jerky and hesitation from the engine/transmission. This is quite dangerous as one time it almost launched me into the back of the vehicle in front of me. Merging onto a highway is also quite dangerous as I am not confident the vehicle will accelerate when I attempt to merge. I have taken it to a dealership and had the technician drive it and he concurred that there is a problem. The dealership has tried working with the manufacturer but to no avail after 3 months. Now the dealership won't even call me back. The dealership, via the recommendation of the manufacturer, has reset "adaptive values" at least 3 times, but that did not fix the problem. There are no warning lights or messages of a problem. While quite noticeable, this problem is even more noticeable when it is in sport mode.