Hello, I wonder about the best way to take on a plumber who is overcharging me for work that should be under warranty. The issue in my case is a faulty combi-boiler swap which made a checkup of the system necessary. As the boiler was newly installed by said plumber, I made no fuss about asking for quotes when I had chosen said plumber because he offered a fully garanteed system. He suggested that it was necessary to fully flush the system to improve the system's performance (increase of pressure up to emergency discharge levels). He said this was standard practice before calling out the manufacturer under warranty as he would have to pay under warranty. Well, now he is charging for this flushing and servicing and, adding insult to injury, has used the name of the previous owner on the invoice. I think I have had it now with this guy - the work is faulty still and the invoice stupenduous. This makes me wonder how best to complain - assuming that he insists on the invoice, who do I go to? Or in other words, what action do I indicate in my letter to the plumber (e.g. I will have to inform the manufacturer of the boiler about this installation which is clearly not up standards). I don't want to pay this invoice, and in the future, I will want another plumber - but only after somebody puts the system right for which I paid 3000 pounds last November. Any advice, as ever, much appreciated.
Fred