Double booking seats

My friends and I went to watch a movie at Ster-kinekor Blue Route. We had booked and paid for our tickets at the counter. When we arrived at the cinema, a man and his girlfriend were in 2 of our seats. His ticket (which he booked online) showed that he had paid for 2 of the same seats. He called the manager who came and told us that this kind of thing does happen. The movie was about to start and the manager made no effort to rectify the situation. The man said that because he had been sitting here first, it was his seat. So 2 of my friends (one had a broken ankle and the other one was pregnant!) had to find alternate seats without any assistance from management. We received no apology at all. Ster-kinekor needs to rectify this situation as it appears to be quite a normal occurrence. This is completely unacceptable.