Cope's Heating in Willenhall

I had a central heating system fitted by these guys a few weeks ago in my late aunts house, I plan to use the property as a let, a week after they fit the system my friend the electrician went in to fit the thermostat, he noticed the pressure was low so he put some more water in, immediately he could hear water dripping, he went to see what it was and noticed water pouring down the wall in the living room, I got the floorboards up to find an unsoldered joint, 2 weeks later I went in to put the heating on because I had 3 viewings that day, after 10 minutes or so I could see water pouring down the wall by the front door, I rang and rang Paul, no answer, so I text him and his father, I ended up having to empty, repair and refill a heating system again that I just paid £2700. 00 for, I have still had no reply from either of them, what made it worse when I removed the floor boards in every room to double check, I found off cuts of pipes, old pipe and boxes the taps came in thrown under the floor boards, no very professional at all. Mel, Dudley.