MasterTech Service Corp DONT USE THEM BAD INSTALLATION Farmers Branch Texas

They sent a Tech to replace the fan motor in the A/C unit outside. This Tech improperly installed the motor which caused extreme wobbling with the unit. He also left wires exposed on the top of the unit, which has created a very dangerous situation. MasterTech has refused to send ANOTHER tech to do the job RIGHT without saying I have to pay a $75.00 service fee (outside the warranty) and $114.00 for it being "after hours" I told them that I already took off work in order to be home, and to expect me to do that again, was just plain wrong. I told them they can come to my home between 4:00 - 6:00 pm, and they keep insisting I have to pay the extra money. Why is this MY FAULT when their Tech did it wrong in the first place? They are deliberately dragging this out and blaming the Warranty Company for what MasterTech did wrong?