Transmission Solenoid problems of the 2015 Chevrolet Malibu

In August 2019, my 2015 chevy Malibu started having with the variable valve timing (vvt) solenoid -part # 12633613 (abt. 80k miles). When accelerating into passing gear, the engine would step out of gear and the rpm's would rev very high while the car slowed. I would have to let off pedal until rpm's lowered, then accelerate slowly. My local garage diagnosed the bad part and began searching for a replacement. They discovered that (1)-gm is the only company that makes the part, (2)-that gm doesn't have any more replacement parts and (3)-gm is not going to make any more. They discovered that many gm dealerships have hundreds on back order also. In December I filed a complaint with chevy customer service; case # 9-5698216592 and conversed with vahmarta ph. #(866)-790-5600 and field rep; logan ext:5916533. Their final answer: (1) gm is the only company that makes the part, (2) gm doesn't have any more parts and (3) gm isn't going to make any more parts. Their final solutin: they offered me a $2,500 voucher towards a new vehicle. Gm is quite aware that this is a problem but is not offering a part to solve the problem. I am concerned about my safety and those around me on the road. The car doesn't accelerate or decelerate properly. What is a proper solution? thank you for your help.