ATF fluid used in CVT Transmission

I only found out the wrong fluid was put in after my car died and the dealership looked at the fluid and saw that it was not the right color. They speculated that the wrong fluid had been put in, and I confirmed this when I looked back at the work order from the mechanic who changed the fluid.

As it stands the mechanic AND the dealership are looking around for a used transmission to put in the car. On Monday let’s hope that the mechanic agrees to cover the cost. He admits to putting the wrong fluid in but is dubious because:

  1. the transmission lasted 20,000 miles on the wrong fluid
  2. only 3.5 quarts where added
  3. CVT’'s have shorter life spans and my car has 100k.

These are the points I will potentially have to argue on Monday so if anyone has any insight, please advise!

Could the wrong fluid cause a slow death? Does quantity not matter; could 3.5 quarts do the damage? Should my car have lasted to 120k-160k?

Where can I find info on the actual life span of this car, not the predicted life-span?