When the same dealership does all of your service, or if your on vacation & have it serviced at another dealership, it is all in their computer files
at the time that you go in for a service, they go into your records & know exactly where & when you purchased the RAM
When they are doing a service correctly, they do at least a 16 point inspection & more when the manual requires it
was it a Pinion Seal ??
Are you the ORIGINAL OWNER or son of the original owner ?
a lot of Warranties are not transferable
Who at the dealership are you talking to ?
I hope you are speaking to someone above the SERVICE WRITER position
like the General Manager or Owner of the dealership
keep your anger to yourself & keep trying to work with them
If you did everything right, it is all on them to prove otherwise, if you were to call a lawyer