I had the same problem in March with Capital One and Delta because of some sort of bugs with my last name which contains a dash... Neither CO or Delta would recognize the problem. So I escalate the problem on the Delta part and the supervisor made a conference call with me and someone from Capital One by calling the customer service...

So they end up fixing the problem and Capital One call me a few days later to apologize : they doubled the sign-up bonus as a gesture (indeed I lost my time with 3-4 calls + one hour in the conference call).