Sorry to hear about the rude treatment, but it can be unfortunately unavoidable in this field. Android 4.1 through 4.3 are all progressively advanced versions of Android that are collectively nicknamed Jellybean. Android 4.4 is nicknamed KitKat. Android versions are nicknamed after desserts or sweets, with ascending letters of the alphabet (i.e., Cupcake, Donut, Eclair, Froyo, Gingerbread, Honeycomb, Ice Cream Sandwich, Jellybean, KitKat).
To find out what version your phone is, go to Settings/About Phone, and look under Android Version. To see if you have an official update available through Samsung and your wireless provider, tap System Updates and then Check for Update. I'm not sure what version your particular phone should be up to. Android phones don't get updated indefinitely--they usually stop getting official updates after about 18 months or so.
If your phone doesn't have any official updates, that doesn't mean you can't enjoy the latest version of Android--but it does mean you'd have to root your phone (which I think was explained to you before), then flash a custom ROM (which is basically installing a version of the Android OS that has been made available by someone who has tinkered and modified the freely accessible Android code to be operable on your phone). This isn't a perfect process, and depending on the ROM and the phone, certain functions may not work correctly. Best not to venture here unless you've gained a fair amount of experience with the system.