So, to put it in the simplest terms, you are saying that you and an entire class completed a course and were told at the end that you were not good enough and would have to do more instruction at more cost in order to be certified--is that correct? You are saying that you contacted SSI and SSI backed the instructor--is that correct?
As I said in my previous post, what you describe is possible, but it should be very rare. Student problems are supposed to be identified early and taken care of early. Students should not get to the end of the course still displaying such problems. There aren't many skills to screw up on the OW dives, and problems in those skills show up early, with plenty of time to be resolved.
Yes, to put it in its simplest terms, it happened what you resumed.
To be specific, the istructor (probably thanks to its experience) didn't do it so obvious and under the sun to be liable for legal action, so a few students got certified right up mostly due to another "trick": we were offered different locations and times to do those 6 dives and each could compose them according to their needs since they were perfectly interchangeable.
However some activies like diving in touristic places were often advertised (quite too often) and while never being mandatory, costing an extra (from which I'd guess the instructor himself took a part of his share too by bringing the scuba tourists to the place...dunno how you'd call this kind of action in english), made up the difference between getting the certification right after the 6th dive or being suggested to take part to more dives (which aren't included in the course/coupon costs being over the 6 open water dives agreed at the beginning) and while this suggestion came (in their own words) to make sure we perfected our skills, it became a firewall between getting OWD cert or not.
Some gave into this and went up to 7, 8 dives while some even had to reach 12 or 20 before getting OWD. Some others instead, like me, just gave up and where never seen again.
I have no problem thinking way more people than expected never report this or even think about it, since while sadness sets in for the lost money (and time, I drove for hours each time to get to the cheapest suggested diving places and slept in car overnight to be ready the following morning and save on renting rooms) and being somewhat accustomed to laws not being enforced here, you don't think about anything also but to move on and forget the bad luck.
I specifically got into a written argument with the instructor since my call to SSI scared the hell out of him to the point that he began issuing gear renting payment proofs/receipts he didn't provide in months (and maybe planned not to ever provide, to get more income by having to declare less taxes) and threatening me of legal action for having fouled his activity name to SSI.
However even talking to what I think is the highest authority of this organization came up to nothing since they told me they obviously have no control of every class, that said instructor has never been reported before and that diving into a touristic location wasn't that bad after all, since he was caring for my own safety.
However after all this I guess that he'd have had squeezed out of me even more money than the friendly fools who gave into giving more money for extra dives as a fire-back for reporting him, so I quit and now I'm locked in this position since all the region-wide SSI dives have him as facebook friend and thus I wouldn't trust my money in their hands for a scuba skills update which could then easily be "take another one", "take another one" over and over.
Again I know my limits, I'm not an expert but I should comply with OWD standards as other people in the class I was in, specially a skilled freediver who gave up for my very same reason and was ahead of many of us regarding aquatic skills, specially compared to the stereotypical weird peoples who got their certification, represented by a guy looking like a lame krill and the usual finicky chick aborting two dives in a row 'cos her brand new mask leaked the bothersome volume of a waterdrop a minute or water being too cold that with a brandnew bought drysuit on (while we all were with 5mm wetsuits, girls too).
Hope this helps some people not to fall into the dirty trap I fell into...