Just be sure they have another copy of the paid invoice when you pay the 1% extra. The paid invoice shows the sales tax collected on it. Never hurts to send a duplicate copy when you're dealing with idiots.
I suspect the Atlanta office is still rife with all the flak they received when the big HMMWV auction went on, and the contractor didn't want the Atlanta office to issue paperwork afterwards. And after that, you know the rest of the story. No more HMMWV auctions....
Some of my past research, with a little help from some friends here on SS, indicate it was more than just a little bit of turmoil following the sales up in Atlanta, so they are probably still bitter at all the MVs up there. Next time you go to the Atlanta MV office, you can tell them to just kiss my ARSE. (Not really, of course, ..... I'll do it myself when I get my A3)
Thanks for your contribution. You have paved the way for me in my preparation of possible bad things to come. My guess, however, is I won't have as much problem as you as I live in a county where GL sells MVs on a weekly basis, and they are well used to it here.
Good luck.