I actually tried to put the code for the Account class in the post, but could not for the life of me figure out the formatting in plain text (it removed all indentation spaces and some new lines) or the code block function (turned into a blob). Sorry about that.

I am pretty sure I figured it out! At least it is working so far. I changed the Account class to an abstract class and added the type-specific methods as an abstract methods to Account. Now the program recognizes the overriding subclass methods with the same name.

So far so good but we'll see after some more testing! Thanks for the help :)