BAD ATTITUDE AFTER MOCROWAVE GLASS LOST

The owner of Maximum Output was shockingly rude when I called to inform them that returned my microwave without the glass plate. He immediately went into a defence mode, but said that he would check the job card which would verify if I had left it or not. After check the job card, which of course made no mention of a glass plate being returned to me, the story changed to screaming that I was wasting his time and he dropped the phone on me twice. I told him that I did not take any part out when I delivered the microwave, instead he gave my the 2 plastic rings and told me that his staff steals such. I tried to explain that maybe he was also supposed to give me the glass plate but he missed doing that. I was dumb completely shocked by this and instead I was later told to purchase the glass plate from their spares..WOW!! I decided to write here because I feel bullied and as much as the glass plate can be replaces, I will not accept to be treated the way the owner of this place has. Is it because I am a woman?? It is clear that he does not care about customers this being displayed by his attitude the minute he started opening his mouth.