使用变量创建类对象

This is my first question on here, so I hope I am asking the 'right' way. The code below is supposed to generate a class object, which should be named via the function createAccount() at the end. I was expecting the account to be a combination of surname and dob, however it creates the class object called accountName and not the product of the variable itself. I can see This is my first question on here, so I hope I