If the promo was still advertising on the site on Jan 25, how can they just make up a promo end date of Jan 18?
I don't care if they ran out of funds - if your promo entices customer to reach a "goal" and then you remove the goalpost, that's false advertising.
To resolve this quickly, spend the 15 min to file a case with the BBB. - Wyndham will surely pony up the 10000 points to cleanse your complaint from their record.
https://www.bbb.org/consumer-complai...nt/get-started