Worst customer service in my life .. During my car...

Worst customer service in my life .. During my car service they dropped something on my windshield and it got small crack .. When I reported this next day , one old man came and just start denying in a rude manner .. he kept saying its rock , its rock ... not even listening what I am saying .. if its rock why i didn't see it earlier .. its just in-front of driver seat and clearly visible .. Its during there service , I don't want them to fix it but at-least accept it and don't disrespect your customer because of them your bread and butter running...