I have seen that happen with other calipers (I rebuild and refinish them for a living). Its not an uncommon problem for aluminum threads to strip. Happens a lot on front right C5 corvette calipers and on Camaro brembo bleed screws. Could be machining from the factory or getting the bleed screw just a little cockeyed. However, once you had them rethreaded, that probably ruined the caliper for good. You could have the hole drilled out and a helicoil or time-sert installed though.
Get an M10x1.0 nut from Home Depot or Lowes and see if the banjo bolt smoothly screws into it. If it does, that is not your problem. If it doesn't, you'll have something more to present to them.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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