Promised $100 Inconvenience Rewards Card but Never Received it

When I first signed up for AT&T Fiber, I was told because of a delay in the installation date, I would receive a $100 inconvenience rewards card. However, I never received it, and from there I decided to call AT&T to figure out where it was. I was routed to AT&T rewards, who told me that while they could see that a $100 inconvenience rewards card was being processed, it was being blocked by another part of AT&T. So I called the normal AT&T number and was eventually routed to someone, I believe on sales, who told me that an inconvenience rewards card doesn't exist and that in her 14 years she's never heard of it. I was then routed to someone else who told me the same thing, and when I told her everyone I had spoken to up to that point had acknowledged the existence of it, and I was definitely told I would receive it when I signed up, she hung up the call. I'm literally at a loss for what to do now.