Weird... $50 off ATT Wireless credit just posted to my Delta Biz card resulting in -$50.00 balance (haven't been using the card at all) - used on my non-wireless ATT Uverse bill back on 9/26/2018 - took almost 3 months to post...
I stopped using the Delta Biz Gold card for ATT payments after it didn't look like the offer worked for Uverse...I think I could have gotten another $100 back. Oh well...