None of the above. SE didn't realize that the game was going to be as popular as it was, and due to this the servers are overloaded with players and have made the data center unstable. To remedy this they are putting a cap on how many people can be logged at one time, but due to people AFKing while staying logged in some of that space is taken up.
SE will (hopefully) be fixing this come JP Wednesday when they add more power to the servers, new data centers and more servers as well. They are also considering implementing a AFK kickers where if a characters logged in for 'x' amount of time without movement/doing anything the server will eject this character from the server.
SE also said they are working on adding another free week of game play to everyone's account. If you wish to return the game and/or not play then I can understand and it is your choice. But if you can be patient for a few more days these issues should be fixed. As to the refund... once an MMO is opened no one will accept it back, so in that aspect you're stuck.
