Spoiled daughter’s birthday

I was so disappointed when I visited Gold Reef City Theme park, they claim that when it’s your birthday the entrance is free. I bought three tickets and the fourth one was supposed to be free as it’s my daughters birthday. However when I got there and produced a certified birth certificate I was informed that it was not sufficient and wanted an original. We travelled for approximately an hour to get there was no way I would drive back to get an original. To avoid spoiling my daughters birthday I bought the fourth ticket. As if I would lie about my daughter’s birthday, rather not promise such then not keep to it.