You've got a fizzer. They're rare but they happen. You probably did your research, it's no surprise that most photographers who have this lens regard it as one of the finest lenses they have ever owned. You know not all 24 f/1.4II lenses are not like yours.
If it's doing what you describe, you should have taken it back straight away. Your seller may have a 7 day DOA policy. However if it should be a simple matter to change it over. It's Easter now, so send them an email (which is dated) immediately with a technical description and examples that describe the fault. As soon as they reopen after Easter, call, make an appointment and do what needed to done within 24 hours from when you bought it.
As an aside, have you tried the lens on more than one body? There's a chance you are wildly out with your AFMA adjustments, or your AFMA technique is giving false data. When in doubt, zero everything and start again.
Good luck with it.