In May of 2019 I made a Dell purchase for $86.89 and received the 10% Dell credit of $8.69 and per the semi-annual (up to $100) promo a credit for $86.89. A few days ago there was a transaction listed as "DELL CREDIT" for $8.69 but it was really a debit.
Are both promos (10% and up to $100) independent? Was the original $8.69 credit an error. I called AMEX CS and they said they will re-credit the $8.69(???)