Wont refund or change movie ticket

I booked 4 tickets online for my husband and children to go watch a movie. Not realizing the date on the app was not for tomorrow I went to watch the movie when they wouldn't let me in as the date on the ticket was for 24 March and not 21 March - No one wanted to help me or change my ticket at the cinema they simply said I have to call the call centre. I called the call centre and after being on hold for 15 minutes the movie we were going to watch has already started. I decided to call it a bad day and go home. I called the call centre again the next day and the woman on the phone refused to do anything and she kept saying there are terms and conditions. Because I printed the ticket already they wont change or refund. This is absolutely unacceptable. So fine I will throw away the money I spent on the ticket but I still want to take my kids to watch the movie but they wont give me the same vitality discount on the same movie either.