Sorry to hear about your bad experience with Dublin Toyota. My first experience with them was very poor, too.
Regarding the issue at hand, I had a similar situation with a random dealership in Indiana from which I bought a tube of 00295-01281 (1281 FIPG) that refused to set up and cure. It took a call or two to corporate Toyota and two calls with the manufacturer of the FIPG to get the dealer that sold me the bad tube to own the issue. They refunded me the purchase price but asked me to return the tube at my cost (and I did it, like a sucker). So long story short, keep pushing Toyota corporate/customer service and assume that the dealer will do nothing. From their perspective it's not their "fault".
In my case with the FIPG, there was a shelf life that the manufacturer recommended but the dealer parts department had no idea about such a thing "because we have several tubes around the service department, much older than the tube at issue, and they all work fine and we've never had an issue". I'd try and push down the path of who makes the fluid, when and where was your fluid made (I hope you have the bottle still), and then try and figure out if there are any age or storage issues that might have contributed to the congealing. If you can demonstrate that perhaps Toyota (the dealer in this case) sold expired or mishandled product, that could go a long way.
On a side note, if I hear that one more time from someone "reputable" in the industry (toyota, lexus, land cruiser vendors, etc.) without owning that something in their process got screwed up and left their customer out to dry, I might go crazy.