You'll need to reach out to the Samsung Promotions Team to check if you followed the instructions for the promotion at the time.
If you didn't, they won't budge I'm afraid and I suspect this is the case here. (Said not knowing which promotion you wanted to use ((I know you said buds but promotions change almost daily)).
I am not employed by Samsung nor do I receive any remuneration as a Samsung Members Star.
My device is an S25 Ultra.