Did you follow the links for the Playstore voucher to claim the offer @Pleco
Check out the small print please of the offer as this will hold the claim start and end dates and provide the timeframe to get the offer.
https://20203.samsungpromotions.claims/googleplay/en-GB holds more information.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "