That's good to know. Tesla customer service not completely dead thenMy confirmation email showed a BJ69 reg, and said the car would be registered the day before collection - so I replied and asked if there's any chance of a different reg. Jagz in the Tesla delivery team was really helpful, and I've now got BG69 instead
While they can chose the number from their set of numbers at will there is no way for them to remove or reject numbers that DVLA give them completely so sooner or later someone else will get that number on their Tesla. But that is not really your problem.