Don't worry about their legal team, stick to your guns
Look at the pic above, this is how you left it, yes?
Now look at this picture, the outlet and pipe work is still attached and in situ but a small section of pipe has been taken out, looking at the breakdown of fittings you can safely assume that the soldered elbow has been unsweated and then the whole section has been pulled up and out of the fitting and then unscrewed out of the theaded joint in the wall, the pipe in the wall (the section that comes out of the leaking fitting) was not gripped or supported while this was getting unscrewed ( evident due to the fact that there is no damage to the wall in the capped off photo.
Likely scenario
The engineer, heated up the joint to unsweat it while gripping the section off pipe with a tool such as pipe grips or similar
The heat from his torch melted the solder in the joint but being in close proximity the heat traveled up the pipe also melted the solder in the joint in the wall. He then proceeded to lever the pipe up and out of the fitting and then carried on unscrewing the whole section out off the fitting in the wall and in doing so weakened the joint in question causing it to leak.
I'm sure most will agree
Matt
Look at the pic above, this is how you left it, yes?
Now look at this picture, the outlet and pipe work is still attached and in situ but a small section of pipe has been taken out, looking at the breakdown of fittings you can safely assume that the soldered elbow has been unsweated and then the whole section has been pulled up and out of the fitting and then unscrewed out of the theaded joint in the wall, the pipe in the wall (the section that comes out of the leaking fitting) was not gripped or supported while this was getting unscrewed ( evident due to the fact that there is no damage to the wall in the capped off photo.
Likely scenario
The engineer, heated up the joint to unsweat it while gripping the section off pipe with a tool such as pipe grips or similar
The heat from his torch melted the solder in the joint but being in close proximity the heat traveled up the pipe also melted the solder in the joint in the wall. He then proceeded to lever the pipe up and out of the fitting and then carried on unscrewing the whole section out off the fitting in the wall and in doing so weakened the joint in question causing it to leak.
I'm sure most will agree
Matt