Long story short

Replaced my Master Cyl with one from Orielly Auto Parts. Brakes went out on Freeway. Shop found faulty Master Cyl. Now Orielly is not wanting to pay for repairs.
Mechanic at shop wrote on the bill that the Master Cyl was faulty and installed correctly.

Orielly says I have to send the part back to the manufacturer and IF they agree they will pay for repairs.
Isn't that the fox guarding the hen house?

I don't have much faith in this process..After all I did not buy the part from the vendor they use. Seems unfair to me..whatcha think???