Radiators don t heat up if I put the hot water on. Should this happen.?

I had a heated towel rail installed in my bathroom by a man working for an independent company subcontracted by the guy who is knocking my bathroom and toilet into one. It didn t work and two of the six radiators stopped working. I called British gas who said the towel rail was plumbed in wrong. The British Gas plumbing engineer wrote down that the flexi tubing should not have been used and replace and the heated towel radiator should have a two way continuous supply.

Apparently the original guy that did this has since been sacked from his job. Another plumber turned up. The people that came completely ignored what the British gas guy said. They got the heated towel rack to work and my bedroom radiator to work buy the hall radiator downstairs wouldn t heat up. During what they did a water leak occurred marking my lounge ceiling wile they were doing something. This has dried out nicely but shouldn t have happened. When I put the hot water on the radiator in the bed room and the heated towel rail stopped working