You have a pretty serious dealer/salesperson issue. The fact the 200x is intended to be a fixed mount and the 200cx is removable is not a simple oversight.
You should expect to pay a bit more for a removable loader and you should probably not look at it as being overcharged--I bet the 200cx is not too much more money than the retired 210 loader. I understand that you were quoted a price and that you feel mislead. I would feel that way too and I would be leveraging back on the dealership very firmly. If you feel the deal was misrepresented, stand your ground. If you think the salesperson was just naive and fthought he found a cheap loader for you, you'll have to decide. Whatever you do, don't try to live with that fixed mount loader unless you are running a nursery or cleaning chicken houses with it full time.
Good luck. When you get what you really wanted and expected, this will be just a faded memory.