Tron Electrical & Lighting Automation

I engaged TRON to replace seven Decora switches (2 dimmer, 5 standard) and to check out one flickering overhead furnace room bulb and one garage door opener bulb. I was verbally quoted $681.39 incl. visit. The two persons who came (one appeared to be a helper) completed the work in less than one hour. The two problem light fixtures just needed new bulbs. As I had all switches and bulbs already, they did not need to provide anything. I paid by VISA, no receipt ever provided. The following day I realized they had failed to replace one of the seven switches and asked them to come back. I was told they "had to charge me for the service call plus tax" and I declined; this already seemed to me a lot of money to replace switches. As no confirmation of the work nor any receipt for the VISA charge was ever provided, no documentation of the work exists. I am now disappointed that I was not more aggressive on my own behalf in seeking alternative quotes from electrical firms less predatory in their pricing, but I was distracted by all the positive HomeStars reviews. Beware.