professional work

I noticed water where it should not be in the bath room today.
The ?professional? that fitted it bodged it, and affectively glued it all in place.
I thought it was coming from the brown side. but after far to long messing about with dirty water it was in fact it coming from the coupling, cleaned it up lined it fitted it all in a bit better, still leaked but worse.
So I have had to put loads of evil silicon seal it there and will have to leave it for a long time to go off.
Finger crossed.