Man, I completely feel your pain. Its so disheartening to have this happen. The only thing I can tell you is that you are not alone. This has happened to others including myself and I'm not just talking about receiving a bass with a problem. I'm talking about the total bungling of a received instrument that is broken and sent back for repair or replacement. 15 weeks to get a good neck installed, with absolute incompetence being the excuse for the delay and then a broken jack. C'mon. Your talking about a lot of money and a whole lot of inconvenience. It is heartbreaking because you put so, so much faith in a brand that you just feel completely fooled. Like a jerk off that was so foolish to fall for the ********. Its true. I had my issues and I have come to my own conclusions about this brand and I don't believe in ordering a custom bass through a dealer miles away.
I hope you find solace and end up getting what you want with your hard earned money.