Disrespectful behaviour

I’m very unhappy and upset with the service provided by one of your employees at the Vienna Airport
Let me explain the situation.
January, 13, 2013 my big family (my husband, my sister-in-law and 5 children all under 14 y.o.) and I came to Vienna Airport to catch a flight OS 675-Vienna-Dnipropetrovsk exercised by the Austrian Airlines. We were successfully registered, shortly after I noticed I forgot about one extra bag and decided to request assistance whether to put it into the luggage compartment or to carry-on. As I’m not that familiar with all the regulations established by the company I hoped to get help or be provided with options. When I came around the check-in desk # 3 and asked what the best way to accommodate the bag I was struck by the unacceptably rude behavior and attitude of your employee on duty. The lady told me it was an extra luggage and I had to pay. When I requested to give it back to me to carry-on she refused to do it. The lady was uncontrolled and disrespectful. With improper manner she said that if I came to her I would have to pay. Moreover she threatened to cancel the flight for me and my family which I believe is far beyond her competence and jurisdiction thus it’s illegal. The employee very well knew that we were lack of time and manipulated the situation. I had no time to sort it out and was forced to pay extra 80 euro at risk to miss the flight.
I’m an experienced and regular customer and never faced such an extraordinarily outrageous set of things. I expected to get a piece of advice. Instead I’m treated like a criminal on loose. I don’t think my family and I deserve it. Is it a special treatment for the Ukrainian citizens???