vw hatfield service is poor

i brought my polo 1.0 2019 model for service on02 february 2023, now my car is stuck, when i was driving it couldnt change gears it was just stuck on neutral. i thougjt we take cars for service to avoid such things not to create problems, but it seems like i have created a problem for myself by servising my car at vw hatfield. now i have a car that i cant drive after paying R9300 for service just less than a montj the car is giving me problems.