1.14.3 AdvancedAbilities hook - Force class

Hey guys, I have a kitpvp server and I am using the AdvancedAbilities plugin (<Edit by Moderator: Redacted not allowed paid resource url> and it gives you the optional option to select a class and have abilities. Id like to ahve a plugin which forces the players to select a class, so if they are in the gui and close it, it instantly reopens and teleports them back to the coordinates: -4.500 89.00 -13.500
Or the best thing would be to not force the inventory to pop up, but to make them unable to leave a worldguard region OR the region -20 86 -29 | 10 101 1, and tell them a configurable message in chat with color codes. If they try to leave, they should be teleported back to the coordinates -4.500 89.00 -13.500