Ah! a branch of the Taxation Office. No wonder she came on all authoritive.
Most of the overpaid clerks who infest the Taxation department have the idea that they are descended from the Gods of Olympus and some of the powers they enjoy are not far short of that.
However, their kryptonite is another Government agency called "The Administrative Appeals Tribunal" which is charged with putting overly enthusiastic bureaucrats back in their boxes.
If you have a legitimate complaint put it in writing to the head of the CSA. Often, doing this will take the problem out of the orbit of the mindless drones and into the realms inhabited by intelligent life capable of making sensible decisions.
If this fails an appeal to the Administrative Appeals Tribunal will see the matter arbitrated by an independent third party charged only with the responsibility of ensuring fairness. If this is just some clerk throwing his/her weight around for the hell of it they will, in all probability, back off rather that cop a knockback from the tribunal.