AA went out of its way to offer OP a seat on OA. That's something it would not likely do for a non-status pax. That's presumably when the CSR decided s/he wasn't going to go through the mess of opening up inventory on what was probably coded as a voluntary change in the first place. More and more, they'e also noted the PNR, so the hang up & call back becomes pointless.

The better move here is to propose the specific of what you want rather than waiting for the CSR to go through the options, if any. That way, you are only making one ask.

CSRs are rated for how quickly they deal with callers. If they can get rid of you in X rather than X+5 minutes, they're likely more willing to go through the effort of forcing the rebook into F or at least overbooking into Y.