ATT virtual reward doesn't work, ATT reward center customer service is a piece of garbage, ATT rewards is a scam to get customers to buy

ATT lured me into getting a connection by offering me rewards if I take up the internet connection with them when I was shopping around after moving into a new home. I chose virtual reward when I received an email asking me to claim. I got a virtual card and when I chose to use it towards my ATT internal bill payment, I started to get error as invalid payment method. I tried different payment methods and nothing worked. I logged into ATT reward center to manage my reward card and it said invalid card. I reached out to the number they gave on the portal- 800-288-9983. It always takes forever to connect to an agent. After the long long wait agent keeps singing the same song. "the virtual reward is valid but not sure what is wrong and transfers to a supervisor and the supervisor says there is nothing he is able to do". This is all scam luring customers with rewards and everything after that is the drama that ATT plays with the customers. I called this number several several times and it just takes your entire day without getting no where.