Apple Watch Promotion Scam

I recently purchased a new Apple Watch SE 3 under the $300 promotion.  There was issues activating the watch and customer support ended up adding the watch to my account as a BYOD, which does not get the promotion.  I've told them repeatedly that this is not my issue to solve, and that they should restore the promotion since they activated it incorrectly.  All they keep saying is that the promotion cannot be applied now, with no offers to fix the problem they created.  Pretty much feel like they've just robbed me of $300 and all they have to say is 'sorry the promotion is gone'.  Unacceptable.