The place is a typical Belgian bar space equipped ...

The place is a typical Belgian bar space equipped with a mediocre dance floor, staffs are toughly professional, the ambiance escalates every Saturday night with DJ playing repetitive music tracks since a year. However, it happened that one of the bartenders (Female) charged me 6 Euro for a little glass of Martini instead of 4 Euro, I gave her 20 Euro but she gave me back in return 5 Euro, when I tried to tell her that the change was unjust, she swept away acting like never had happened although I spend roughly 15 Euro every night I go there!