Think I need a new neck . . .

After tightening up my truss rod repeatedly and it always going back to not being right, intonation out round 7th frets and not having money to buy a new bass as I spent all my spare cash on the fretless which I don't want to sell I've decided a new neck is what's required. Where could I get a new RBX 250 yamaha neck? I've tried phoning lots of music shops but no-one has actually got back to me and this was over 3 wks ago. I've tried direct from yamaha but they haven't got back to me - GAAAH!! any ideas people? Thanks.