Does this business really exist?

Appliance repair claim to be able to do repairs on numerous domestic appliances. I had a problem with a gas geyser and they sent out their workmen. They did not do any diagnostic testing and repair, but simply replaced parts until it seemed that the problem was solved, charging the customer for all the parts. The cost of the repair, being roughly the same as that of a new geyser. The problem recurred after they left and they did return. for the call back, with similar results. After replacing the new batteries I had installed prior to calling them out, the problem was solved. The previous battery closed circuit voltage being too low to activate the solenoids. I asked for a refund of their exorbitant labour costs and was given emails that do not exist. This company seems to be in the same category as those that let out places, the do not posses. Their technicians lack the skills to do the work. Their email on the invoice does not work, neither do any of the other emails I was given.