By the sound of it, these divers got very little instruction for their money. As long as they paid very little money for it, fine. If they paid the standard whack for a nitrox course, they were robbed.
32m on 32% is not really a problem, and has a reasonable margin of error. I have seen instruction in the past where the instructor is effectively the depth gauge. As long as he wasn't distracted by other divers, no problem. The divers themselves bear some responsiblity for any cock-ups by diving without computers.
Complaining to the dive centre would most likely have been a complete waste of time. If they're crap, and it seems they were, name them so others can avoid them.
32m on 32% is not really a problem, and has a reasonable margin of error. I have seen instruction in the past where the instructor is effectively the depth gauge. As long as he wasn't distracted by other divers, no problem. The divers themselves bear some responsiblity for any cock-ups by diving without computers.
Complaining to the dive centre would most likely have been a complete waste of time. If they're crap, and it seems they were, name them so others can avoid them.