I manage a small building, which isn't really big enough and we've done lots of tinkering with it to try and make more space.
We shop around for trades, but generally , once happy with them, use them for 3 years before a review.
One job we've done recently involved a participants wall that needed some wiring moving.
Later our regular electrician was called to do other work and has sent an absolutely furious email about the quality of the electrical work when the partitioning was done. Demanding to know the name of the firm so he can report them to regulators, it's not safe, absolutely shocking that we're using such cowboys etc.
It was him (his firm). He's very embarrassed and apologetic, it was a member of staff who no longer works for him, he's coming straightaway to put it right.
Is that enough, or would you want to do something else? Would you keep using him?