If you had even read the statement released by SE you would know they ARE NOT CHARGING YOU FOR APRIL. You have zero room for complaint since they won't be charging for services not rendered. And if the if the servers have to be offline longer than that then they most likey won't charge you for that either. SE is being considerate of YOUR pocket book at the expense of their own. They are well aware of what this could do in the long term. I suggest you just back off now because you started a fight you can't win.
One last thing, if SE had backup servers don't you think they would have used them multiple times by now rather then taking the game completely offline during server maintenance?