Poor Service

I am not in the habit of giving poor reviews, but I would seriously warn any prospective client to not use this plumber for any work at all. The work request was to install new piping for a new gas geyser. The geyser has 3/4" piping, but he decided to install 1/2" piping. The hot water flow to the bathrooms is so weak that it takes ages to fill a bath. I have requested on many occasions for this to be corrected and now get verbally abused when requesting help.