Bad attitude and not too friendly

I went there to price goods for my 60th birthday party. I walked in and greeted him with the following greeting - 'Hello' I said, he replied 'hello' , I followed with 'how are you ?' to which he replied 'I already said hello' , I replied to this with ' I asked you how you are' , he replied 'what can I help you with ?' . This made me unhappy, I think he was rude. I priced one item ' a case of local castle beer. It was 35 rand more than my other store. I was going to order goods for 330 people who are heavy drinkers, including 35 bottles of Jameson whiskey, 35 bottles of Johnny Black, 22 bottles of Gin at around 220 a bottle etc. My 50th cost me R55000 for booze with 200 people. He lost out on a huge sale.