We bought Audi from Armando Tire Services. But one week later we heard strange noises, which were coming from the engine. As well as the car was shaking. We asked the company to make the diagnostics for us. The mechanic took a look and said that it wasn’t serious, so the total sum of the diagnostics would be $430. It was fine, but when we came to pick the car, the mechanic asked to pay $780. It isn’t professional.