Jeanne - I want to be careful here, because I don't want to later be accused of making false accusations. But I smell and "bait and switch" here.
While the Prodigy is indeed manufactured by one of the Yokohama tire factories, it is actually just a "private label" tire. That is why the name Yokohama isn't on the tire - it is not a tire you will find anywhere on the Yokohama website.
Now that doesn't mean Yokohama didn't make it - they did. But they didn't badge the tire with the Yokohama label. Bluntly, if there is a label to be put on the tire, it would have to be, "Discount Tire," because the tire is made and sold only for groups like them.
That also doesn't have to mean that the tire is utterly worthless. CR has tested tires like Dayton, which is a low, (now semi-private) brand from Bridgestone-Firestone, and sometimes they rated higher than both Firestone and Bridgestone. Cooper makes a ton of "off-brand" tires - so does Goodyear. Some of these tires are pretty good overall, some not so.
But they are made available both to be sold to the consumer at a lower price, and for the dealer to pay less for them than they would a true Yokohama. That, I suspect is how those tires got on your vehicle.
Again, I don't want to be accused that I have called those tires junk or unsafe - I just don't know. But because I don't and you don't, and you do have a solid history you can read about (and from multiple sources) about the Geolander, I suggest you take it back and insist on those tires.
I had a dealer put on a set of Firestone tires for me once that I would NEVER have allowed to be put on my vehicle. I knew which Firestones I wanted, and asked for them. But somehow, they ended up putting these on. When I complained, they ended up admitting that they put on tires they had in stock and thought these would be "just fine." I put up a fuss and they ended up swapping them out at no charge, even though the Firestones I wanted were more expensive.
That is what I suggest you do here. My guess is that between the desire to put on "something they had" and the desire to be able to pocket a few more dollars, that is why they did this. And who knows - maybe they knew there would be something like a two-week wait or something for more Geolanders, or that their cash flow was too tight to be ordering anymore tires at that time (it happens).
Regardless, you have a right to what you asked for. If they won't help you, there is a neighboring Sears Auto, Firestone Complete Auto Care, Goodyear/Gemini, and many more just down the street.
Thanx so much for writing to us. Hope this helps.
I called the dealer this morning and took the car back in this afternoon. They replaced the tires and comped me the difference in price for my trouble. Thanks for your advice!