transmission pressure switch replacement

My advice...stay far away from this place. I was referred here for transmission work by a mechanic who didn't do transmissions. I researched heavily the work to be done, even calling 6 different shops. The work should have taken roughly 30 minutes, and the part is listed between $45-65 online (including OEM price from my vehicles' manufacturer). Granbury Transmission Center quoted me $40 for the part and 1 hour labor. I said okay. Afterward, David there called to tell my wife it was ready, and proceeded to tell her the part was now $90 and labor was 1.5 hours. When she inquired as to the increase, he became belligerent and condescending, and told her, "you don't understand." He then threatened to pull the new part, and give us the old part if we didn't like it. One last thing, the "free diagnostic" was cited as part of the increase in labor time. Since I couldn't find any reviews for this place any where I felt it was important to spread the word.