Synchrony Bank Sam's Club credit card review: Rewards points from credit purchases

I have had this credit card for over fine years and I have A+ credit. 2 Months ago with no warning, cancelled my card. I called and asked why and they told me I was a credit risk and that I would be receiving a letter in the mail that would explain why. I have always paid in full a week, sometimes more before the due dates. I was upset at the time and figured I'll just start using a different card but I very quickly found out that when your account is closed all of your reward points are forfeited. They closed my account for no valid reason so they didn't have to pay out my reward points. Which at the time were over $3,100.00. I've called so many times and talked to so many people and I get the same answer. NOTHING!