Made my car a death-trap!!!

We took our car for service to this provider. Within less than a week of having our car back, vehicle automatic gear shift was messed up (over revving and super fast changes suddenly), the cherry on top... car suddenly died on the freeway. NONE of these were EVER an issue, until we took the car for service here. We took it back to complain and as per usual, they do not want to acknowledge ANYTHING. Now, a month later... car has again DIED, once again on the FREEWAY and we are having to incur additional expenses. The gear changes have been causing us issues as well... since taking the vehicle to you guys, we now have a moving death-trap!!!

This is simply NOT acceptable!!! Our vehicle had NONE of these issues until it was due for a simple annual service. Someone clearly did something and touched something they had no expertise in touching and now we are sitting here with an extremely dangerous situation on our hands and zero accountability.