Best Stiebel Eltron Water Heater Install in Phoenix AZ

Disappointed. The guys that came to do the work, were very nice and professional. The disappointment came after I got the invoice. My master bathroom light fixture started flickering and then stopped working. The next morning, I requested service online at maybe 5am, got a call around 6:30, guys were there at 10am, I was really impressed. Gave me an estimate of $260 to replace master bathroom light switch that was shorting out, ok, not that bad of price. When done, they gave me the invoice to pay of $593, I paid, not paying attention. Opened the invoice after to find a $330 troubleshooting fee. This very unprofessional business practices and definitely will not be calling them in the future. On that note I am very tired of electrical companies (3rd one this year), can anyone recommend an honest and reliable company?