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After 33 years as a plumber I still read the instructions.
It's been chucked in as cheap as possible.
Remember I also said this guy is not a plumber.
That lot needs sorting out properly and there's no way the (person) who did that is going to suddenly get good enough to put it right.
A plumber has not done this work that is your main problem
You keep referring to a plumber and work being done by a plumber, a qualified plumber has not been near this job.
Pipes hanging around, unlagged etc, is what you would get from some fly by night who knocked on the door.
Could also dig out the BS of water pipes near electric sockets and obstructing electrical inspection covers into wiring terminals.
If you had got a registered plumber in, this would not have happened.
If that's how bad the workmanship is in plain sight, what is it like where you can't see it?
25 years Ive been a plumber and all I can say is Oh dear.