Have literally called about 20 times today Trying ...

Have literally called about 20 times today Trying to get through to someone. 6 different people have picked up and always put me on hold then hang up. I am trying to simply purchase tickets and am having a terrible experience. I even tried to go online to purchase tickets and the system keeps saying I'm scheduling more than two exhibitions within an hour of eachother when each time I select is an hour apart each. Terrible terrible customer service