I'm sorry to read that you have had these undeserved set backs. In my experience the most prevalent human quality I encounter is incompetence. It seems to be everywhere and I have an endless fund of similar stories to yours. When asking for something to be made I always provide good quality drawings, or a pattern, and talk through the job until I'm sure, I hope, that what's required is completely understood and they STILL cock it up. It's unbelievable.
Not in every case, but fairly often, the problem stems from the job being passed on from the person one originally discussed it with to the person who actually does the work. A sort of 'Chinese Whispers' takes over but how can that be case when there are drawings, or a full scale pattern, to follow ?
Mike, you will prevail but no one needs all this aggravation.