bad service

On the 12th of April 2016 I went to shoes gallery to exchange shoes that I have purchased the previous day, I ws assisted by a gentleman who went to the bck to find the correct size then had to wait at the counter for about 10 to 20 minutes without service because there was nobody at the cashier counter I had lifted my hands to ask a gentleman what was going on he been responded to me rudely and told me that I don't know what I want and that I don't treat people right I did not say anything to him for him to respond in that manner that he did he told me that he does not care about clients and that we do not treat him in a proper man I've been asking what is it exactly that I did he then told me that he asked me what is it that I wanted I told him that the gentleman has already brought the size 5 shoes that I was looking for and now I wanted to exchange she kept on going and going and insulting and insulting me even left the store and the lady at the counter finally came exchange the shoes for me when I ask what was The Gentleman's name they refused to give me The Gentleman's name and told me she will not provide me with the gentleman's name all of them when not wearing name tag