Although my bad oil/filter change experiences were quite long ago, I do understand your concerns.
*I’ve paid for an OCI that wasn’t performed
*Oil not put back into the engine while the tech was backing out the car
*Filters put on so tight thatI crushed it trying to remove on the next OCI
*CV joint boots razor sliced(sabotaged) while the tech did the OCI
*In each case, I caught them and forced them to make good on each service/repairs and technicians were fired.
*I’ve paid for an OCI that wasn’t performed
*Oil not put back into the engine while the tech was backing out the car
*Filters put on so tight thatI crushed it trying to remove on the next OCI
*CV joint boots razor sliced(sabotaged) while the tech did the OCI
*In each case, I caught them and forced them to make good on each service/repairs and technicians were fired.