Bait & Switch would imply they purposely advertised one thing without intending to give it to you. What looks like is happening in your case is a breakdown in the process somewhere. It usually only takes a few days. My 3/17 purchase of $19 was credited on 3/20. When you've called have you asked to be escalated to a supervisor? Disputing the charge may backfire, as that would end up going back to the merchant (ViaSat), though they aren't party to this complaint. It's purely a Barclay problem to be resolved.
I was saying Bait & Switch because multiple Barclay agents insisted that this's a systemwide issue, and they said there's no timeline to resolution. In that sense, no expectation can be made as to whether one can receive this benefit or not, hence my Bait & Switch comment. It's great that after posting this thread, I now learned that there're other DPs that successfully received this benefit, hinting that the "systemwide issue" is non-existent. This gives me more confidence to go back to their customer service, and insist that they solve my issue as an individual breakdown, instead of deflecting everything to the system. For the record, I did ask to be escalated to a supervisor but was refused. Agents were very adamant about the problem being systemwide and told me they can't manually adjust. Your comment on disputing is on point, I think I'll try again with Barclay's reps first.