I was charged for the installation of a EGR. vacuum pump on my truck This was not installed and acknowledged by the service manager. I want my cost of

Obviously if you were charged for work not performed or products not delivered, you are entitled to a refund of those monies.  While the Service Manager has verbally told you that the product was not installed, be cognizant that the better evidence should you have to pursue this is to obtain confirmation of this in writing.