replaced rear window front control not working

I had a shattered rear window replaced by a reputable glass company. Prior to them replacing the rear window, the automatic controls in the front worked fine. The rear window was able to move freely from the front and back switch. However, upon replacing the window, the technician checked the switches and the window no longer works from the front switch, but still works from the rear door panel switch. He is telling me that is not his problem but that my front switch is either dirty or damaged. Is he correct or did he forget to connect a wire?