Act like a manager - lead by example

On the 8th of April i went to the Toys r us shop in Heidelberg, i found that they again had no stock of pampers so i bought huggies. The next day i took back the huggies unfortunately i had my EFT slip. The manager (Braemar is his name) didn't even think for a second and said \no"";and the first thing he asked me was \""where did you get the slip\"". He didn't greet me and when i asked him \""how are you\"" he said why am i aggressive"