How do you know it was a fiasco? He did not provide any after-photos. Good chance he got the job done and moved on.
You obviously don't have a scooby about how the job should be done to say that. That or it's a reflection of your own standards
Imagine you were the customer and you bought a wardrobe too tall and no way to return it, what would you have done with it? No one else would have wanted these odd jobs and it was fortunate for the customer the OP's services are available. No matter what the OP did with it, the customer would not have lost more than the loss of buying something that could not be used.
OK, point taken, albeit that most clients I have worked for have had far higher standards than (in any case without a top the wardrobe carcase will in all probability prematurely self destruct, but I'd lay odds the doors will go first). The plain fact is that the wardrobe has doors made with a mitred frame (clearly visible in the photo). That means it is quite possibly a mitred construction, in which case the way to attempt this would have been to cut the top rails off, recut the mitres on the end of them, trimmed the stiles to length, shortened the upper panels to fit the top rails (which in all probability are grooved), mitred the ends of the stiles and reassembled the doors. A proper job.
Even if this weren't done, the original top rail might have been cut down to fit and planted on. Not as good, but still respectable if executed neatly
Or possibly a couple of plain MDF doors could have been produced, stained and lacquered or alternatively just gloss paintef then fitted. A simple, adequate fix.
As to the missing top the original could have been refitted using 2 x 1in softwood cleats around the inside.
It ain't rocket science and I've seen it done. The problem is as much down to lack of pride in workmanship as anything, or it could just be that the OP is trying to wind people up on this forum.
A decent handyman doesn't need to be brilliant, but they should be competent in a few areas, e.g. basic plumbing, changing locks, basic painting and.decorating, etc. They also need to know their limitations, know when to walk away from stuff, and to take pride in what they do. I'm sure many competent DIYers could do a handyman's job and do it well; in fact some of the projects I've seen tackled by forum.members who aren't trade have been very impressive