5 hour delay flight, then a threat to charge me.

I am absolutely disgusted by the way my flight delay this weekend was handled.<br> <br> We checked in at 17:00 for our 19:25. I had a fragile bag so I decided to go early. The check-in clerk did not mention a word about any delay. Once through the check in gate we freshened up and at 18:00 I went to look at the board. I then see that the flight is delayed to 22:25. Frustrations high, we waited for 10:00PM. Finally at 23:30 we boarded and took off at 00:00.<br> <br> On the flight I ordered a beer, chips and biltong. I wanted the air hostess to use the voucher I should have been given. She refused and said I had to pay. When I informed her that I only had my card she said she will have to inform the captain and stormed off before I could say another word. About 1:30 she returns with a form and shouts to me that she is charging me for theft and needs my details. This situation was extremely embarrassing for me, as other passengers then looked up. I tried to interrupt her to tell her I am prepared to pay she raised her voice again and told me to let her speak. Once she was done, I again said I would pay and then she said that I need to pay guest services when I land. I agreed and she wrote down my det