I ordered the ultra 512 in navy on the 21st of Feb & the promotion was for Buds pro. Not had either yet lol.
I honestly don't think it was... but good luck. This promotion definately changed to offer the Buds Live on 29th January after the official release date of the S21 ultra. This 'Buds Live' promo is also confirmed in the Benefits tab of the Members App.
If you ordered indirectly from a carrier then it may be possible that they did not publicise the correct terms of the freebie giveaway.
The buds pro and tag were certainly only available for pre-release orders. I would check with the Samsung promotions team to confirm your order.