It's not adding up here...

1) I don't get why a dealer would be so secretive about a repair...

2) I am at a loss to understand exactly where the all oil you replenished god knows how many times went...you never said that you saw it come out of the exhaust, and you couldn't possibly have missed all those liters of oil being burned faster than the gas you went through...impossible. It doesn't just disappear into thin air.

3) "Broken fans and oil pump issues"...sounds highly suspect to me...and not something I would accept without further explanation or proof.

Nothing of what you have posted here adds up to me...