You have obv. excellent extemporaneous speaking skills; I'd bet that among any competition (particularly younger) - that would become quickly apparent in any interview.
'Office' - yeah, well, all my info is hearsay over many years - as has been quite enough for me to truly Appreciate that I never had to bear being in one. But you are not moi, and it sounds as if the worst associations (phone answering, creating TLAs, filing/data-entry! and the like) are not what you'd be doing much of?
'Customer support' - well, what one would Like it to be - entails not merely people and language skills, but also a damn good facsimile of meaning, actually to Help! IMO. No way to guess whether this place would expect any overt lying, as likely you could not do; you can certainly hope: Not.
I'd think you haven't much to worry about re Your skillz; maybe more about how sane is the management(?) You can pick up any silly details easily -- much is just a bunch of boring machines doing repetitive tasks. Easy as setting the clock on the VCR. Surely Dilbert is a small exaggeration. Shirley.. ;-)
So then - Break a Leg!