Ticket booking

On 27 Jan my son booked a ticket for me for 30 Jan for the show Daddys home at 17.45. It was the love seat which I wanted for me and my friend. He put the ticket in my purse.Tonight we went to see the show. My friend bought popcorn I went to the Ladiesroom. My friend and I the handed in the ticket it was said the ticket has been used because the date was 27 Jan. Mavis Theyise who sold the ticked made a mistake. I asked to speak to the manager. He said they do not know if I used the ticket the 27th. I asked them to check.They had no record and said I must buy a new ticket. I was embarassed. I was disappointed in their customer service. You do not treat people this way. How do they train their staff. Each incident must be treated on its own merit. Do I look like a ********? Would I try to slip into a movie? I treat my clients with the utmost respect and my policy is the client is always right.