Keep calling and faxing. www.faxzero.com allows 2 free faxes per day.
Fax their DC office and in-state offices. Google their name and look for “contact” on their web site for the fax numbers. Write it on a card and keep it handy. Fax often.
prepare to observe money in direct bribes paid to foreign banks and no questions asked by IRS. IT IS COMING.