IngramSpark sales tax problem

For weeks now (four?) I have been wrestling (in a diplomatic/polite way) with IngramSpark over the collection of sales tax. Long ago, I provided them with both state sales tax declaration documents they require, and both documents show up in my profile. HOWEVER, whenever I place an order for my books that I intend to resell, state sales tax is added to the order.

I would wait to order until this is all sorted out, but my book launch is in two weeks, and I do not have the luxury of waiting. To this point, I have now paid over $60 in sales tax, that I will have to pay yet again to my state (Texas) again, when I sell the books.

My only recourse is to email their “support” function. They are slow to respond: after days roll by, they write that they will be “looking into the issue.” Another week rolls by and they write that the matter has to be referred to another department. Another week or two rolls by and that department says they can’t handle it and I need to email their finance department directly (which I have done).

This seems to be extremely poor and glacially slow support, but I appear t have no recourse.

Has anyone else had a similar problem, or cracked the code on how to get real (and timely) help there?