Did you talk to normal CSRs or is that what the underwriters told u? If you haven't tried calling their recons / underwriting department you can try calling. A number of people got this issue resolved by talking to the underwriters directly
+1 or the customer retention dept
I first spoke to a regular CSR who escalated the call after speaking to several people I just didn't have the energy for it anymore. I'll try again soon but I just believe after all this time I shouldn't do so much work to get a card unsecured.