Synchrony Bank Credit Card Complaint

Synchrony Bank Credit card department,

Advertising and marketing New York

Walmart was running a promotion on a credit card. Save $35.00 when you open a card and use it for your first purchase. I applied and got granted the credit card and bought my first item on the same day. They are not honoring the promotion due to what they say " It is policy to use the promotion on the same day of opening the card. Due to the fact that your purchase was made on - - and payment was processed - - we cant apply the promotion ''. They wont honor the promotion even tho i opened the card at the time of checkout and used it to purchase an item on the same day because it took them 5 days to process the payment. The Item was ordered and Payed for using this new credit card On - - 2015, however they decided to process the payment on - - 2015.