Cruise Control problems of the 2003 Infiniti G35

Vehicle had issues with not wanting to accelerate faster than 5 mph. Towed vehicle to dealership, they stated it was a pinched cruise control ground wire and fixed it under warranty. Vehicle operated fine for one week, had the same problem. Towed vehicle back to dealership. This time was told that the ecu and wiring harness needed to be replaced due to it getting wet from a grommet that was loose due to a aftermarket electronics wire under it. Not covered under warranty. Have not had vehicle for ~5 weeks and no loaner car was provided. Upon questioning Infiniti about why the delay, I was told that apparently they needed to replace the wiring harness and none were available. This is because apparently the 2003. 5 G35 coupe has a different harness than the 04 G35 coupe. Was told japan had to specially make a harness and ship it. Will not get harness till the 20th of March. Problem was that dealership should have caught the problem with the first trip there. Had that been caught I would not be paying ~3000. 00 and with out a car for 5 weeks. Upon trying to discuss options with service manager I was told that they would go to court, and that they would win because they have more money than I do.