Got the refund, Kevin.
Replied to their support email with the following notes:
first, your statement regarding the conditions of this sale is erroneous, as the wording of the Sales Special page was changed by NI after my purchase;
second, your statement regarding refunds as a “one-time courtesy” is erroneous, as full refunds during a period of 14 days are part of NI’s general conditions of sale;
third, please note my displeasure with the way NI are handling this situation by covering up their own mistake and not providing a suitable solution towards long standing customers.
(everyone getting their coat)