Years ago, I started a small business under a corporation for my websites. 
 I received a letter twice from “Corporate Controllers Unit”. They were charging us $225.00 charges for annual corporate fees.  Just a few minutes of research revealed that this is a scam.
The letter threatens that if you don’t pay “Delinquent” but at the end of the letter they state that do not represent any branches of the government:
“This product or service has not been approved or endorsed by any Government Agency and this offer is not being made by an agency of the Government. U.S.C.39.6.3001(d). This is a solicitation for the order of services, and not a bill, invoice , or a statement of acocunt due. You are under no obligation to make any payments on account of this offer.”