I worked as a service technician for a home service company. I was assigned to a job at a client's house to install a new air conditioning unit. When I arrived, I noticed that the old motor was not working properly. I diagnosed the issue and determined that it needed to be replaced. I then installed two 3-phase motors instead of one single-phase motor, which was not the correct configuration for the unit. After completing the installation, I noticed that the client's air conditioning unit was not working properly. I took the old motor with me and explained to the client that they would have to pay the remaining balance of the invoice. The client was upset and frustrated, but I explained to them that I had done my best to resolve the issue and that the old motor was not the correct configuration for the unit. I then offered to provide a refund for the old motor, but the client declined. They were satisfied with the new motor and the work that had been done, and they paid the remaining